Question

A bus travels ata a distance of 120 km with a speed of 40 km/hr and return with a speed of 30 km/hr . Calculate the average speed for the entire journey?.

Answer 1

S1 = 40km/h
d1 = 120km/h
t1 = d1/s1
= 120/40
= 3 h


S2 = 30km/h
d2 = 120km
t2 = d2/s2
= 120/30
= 4h
total time = (3+4)h
= 7h
total distance
= (120+120)km
= 240km
average speed
= total distance/total time
= (240/7) km/h
= 34.5 km/h {ans}


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