The speed of a railway engine is 42 km/hr when no compartment is attached and the reduction in speed is directly proportional to the square root of the number of compartments attached. If the speed of the train carried by this engine is 24 km/hr with 9 compartments attached, the maximum number of compartments that the engine can pull is?
Topic: Time and Distance Math
A distance of 425 km separates two trains moving towards each other at a speed of 200 km/hr each. What will be the distance between them after 1 hr 30 min, if they reduce their speed by half, every half an hour?
Two boys A and B start at the same time to ride from Delhi to Meerut, 60 km away. A travels 4 km an hour slower than B, B reaches Meerut and at once turns back meeting A, 12 km from Meerut. A’s rate was?
The ratio of the speeds of a car, a train, and a bus is 5 : 9 : 4. The average speed of the car, the bus, and the train is 72 km/hr What is the average speed of the car and the train together?
A flight of Jet Airways from Delhi to Mumbai has an average speed of 700 km/hr without any stoppage … What is the average stoppage time per hour of a kingfisher flight if both planes fly at the same speed?
A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km and 11 km per hour respectively. What is the distance between them after 6 minutes?
The average speed of a bus is one-third of the speed of a train. The train covers 1125 km in 15 hours. How much distance will the bus cover in 36 minutes?
An airplane flies twice as fast as a train which covers 60 miles in 80 minutes. What distance will the airplane cover in 20 minutes?
Ramesh is walking at a speed of 10 kilometers per hour. After every kilometer, he takes rests for 5 minutes. The time taken to cover a distance of 5 kilometers Ramesh is?
A person wishes to reach his destination 90 km away in 3 hours … His average speed for the rest of the journey should be?
A car goes 20 metres in a second. Find its speed in km/hr?
A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman chase him. The thief and the policeman run at the speed of 10 km/hr and 11 km/hr respectively. What is the distance between them after 6 minutes?
A and B start from the same point and in the same direction at 7 a.m. to walk around a rectangular field (400 m ☓ 300 m). A and B walk at the rate of 3 km/hr and 2.5 km/hr respectively. How many times shall they cross each other if they continue to walk till 12 : 30 p.m.?
A cyclist rides 24 km at 16 kmph and a further 36 km at 15 kmph. Find his average speed of the journey.
Anna left for city A from B at 5.20 a.m. She traveled at the speed of 80 km/hr for 2 hours 15 minutes. After that, the speed was reduced to 60 km/hr. if the distance between the two cities is 350 km, at what time did Anna reach city A?
A train travels at a speed of 30 km÷hr for 12 minutes and at a speed of 45 km÷hr for the next 8 minutes. The average speed of the train for this journey is?
Rani goes to school from her house in 30 minutes. Raja takes 45 minutes in covering the same distance. Find the ratio between the time taken by Rani and Raja.
The jogging track in a sports complex is 726 meters in circumference. Deepak and his wife start from the same point and walk in opposite directions at 4.5 km/hr and 3.75 km/hr respectively. They will meet for the first time in?
How long must a driver take to drive the final 70 miles of a trip if he wants to average 50 miles an hour for the entire trip and during the first part of the trip he drove 50 miles in {1 ☓ (1 ÷ 2)} hours?
An express train traveled at an average speed of 100 km/hr, stopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point?
A family planning a weekend trip decides to spend not more than a total of 8 hours driving. By leaving early in the morning, they can average 40 miles per hour on the way to their destination. Due to the heavy Sunday traffic, they average only 30 miles per hour on the return trip. What is the farthest distance from home they can plan to go?
A star is (8.1 ☓ 1023) km away from the earth. Suppose light travels at the speed of (3.0 ☓ 105) per second. How long will it take the light from the star to reach the earth?