Question

Abdul while driving to school computers the average speed for his trip to be 20 km per hour on his return trip along the same route there is less traffic and the average speed is 30 km per hour what is the average speed for Abdul​

Answer 1

Answer:

For His journey

let distance covered be= D KM

average speed=20KM(GIVEN)

time=distance/speed

time=D/20hrs

In return journey

Let distance covered be = D KM

average speed=30KM(Given)

time taken= distance/speed

Time= D/30hrs

Total distance covered=D+D= 2D km

total time taken = D/20+D/30= 5D/60hrs

Average speed= total distance covered/total time

=2D/5D/60. transferring 60 above= 2D×60/5D

=24km/hr