Question

Abdul while driving to school computes typing speed of history to be 20 km per hour all the return trip along the same route there is less traffic and average speed is 30 kilometre per hour what is the average speed of for Abdul trip

Answer 1

while driving to school
speed=distance/time taken
20=x/t1
time taken,t1=x/20h
on return trip
speed =distance/time taken
30 =x/t2
time taken,t2=x/30
total distance = x+x= 2x
total time =x/20 +x/30
=x/12
average speed = 2x×12/x=24 km h