abdul while travelling to school computes the average speed of his trip as 20km/hr on his return along the same route there was less traffic. the speed was 40km/hr. find the average speed
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suppose the distance covered one way is X
therefore total distance will be 2X
one way time when speed is 20 will be x/20(time 1)
time 2 when speed is 40=x/40
acg. speed= total distance/ total time
=2x/(x/20+x/40)
=2x/(3x/40)
=80/3 km/hr
=26.7 km/hr approx
therefore total distance will be 2X
one way time when speed is 20 will be x/20(time 1)
time 2 when speed is 40=x/40
acg. speed= total distance/ total time
=2x/(x/20+x/40)
=2x/(3x/40)
=80/3 km/hr
=26.7 km/hr approx
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