Question

a bus travels a distance of 120 km with a speed 40KM/H and returns with a speed of 30KM/H.calculate the average speed for entire journey

Answer 1

Distance = 120 km
speed= 40 km / hr
speed = distance / time
time = distance/ speed= 3 hour

for return of train
distance = 120 km
speed = 30 km/ hr
time = 4 hr

average speed = total distance / total time taken

= 120+120/3+4
=34.2 km / hr

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Answer 2

average speed = total distance travelled
___________________
total time taken

=> as= 120+120
________
t1 +t2

=>as= 240
______
(120/40)+(120/30)

=>as= 240
____
3+4

=>as= 240/7
=> as = 34.2 KMPH