Question

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

Answer 1

Answer:

The required answer is 24km/hr

Answer 2

Answer:

let the dist. be x

dist. while going = dist while returning

time = dist./speed

so, time while going = x/20

time while coming =x/30

total time= x/20+x/30

=(3x+2x)/60

=5x/60

=x/12

total dist.= 2x

avg. speed = total dist./total speed

=2x*12/x

=24km/hr