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?
Note
Time is taken to cover 600 km = (600 ÷ 100)hrs = 6 hrs.
Number of stoppages = {(600 ÷ 75) − 1} = 7.
Total time of stoppage = (3 ☓ 7) min = 21 min.
Hence, the total time is taken 6 hrs 21 min.