A cyclist rides 24 km at 16 kmph and a further 36 km at 15 kmph. Find his average speed of the journey.
Note
Total distance travelled = (24 + 36) km = 60 km.
Total time taken = {(24 ÷ 16) + (36 ÷ 15)}hr
= {(3 ÷ 2) + (12 ÷ 5)}hr
= (39 ÷ 10) hrs.
Average speed = {60 x (10 ÷ 39)}km/hr
=(200÷13)km/hr
= 15.38 km/hr.