Question

abdul while driving to school compites the average speed for his trip tp be 20 km/h. on his return trip along the same route there is less traffic and the average speed is 40km/h .what is the average speed for abdul's trip?

Answer 1

let distance for his home to school be D
time=distance/speed
time=d/20
distance for school to home is also same let it be d also
time=distance/speed
time=d/40
average speed=total distance/total time
average speed=d+d/d/20+d/40
=2d/d/20+d/40
=2d/4d+2d/80
=2d•80/6d
=80/3
=26.66m/s
hope it is helpful for for more