a man goes to a place at a speed of 13 km/hour and comes back at a speed of 7 km/hour. his average speed of entire journey is:
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take lcm of ( 13, 7)=91 nd take it as a total distance
now, case 1
t= 91/13=7hr
case 2
t=91/7=13 hr
now , average speed= total distance/ time
= 91+91/7+13=182/20=9.1 km/h
now, case 1
t= 91/13=7hr
case 2
t=91/7=13 hr
now , average speed= total distance/ time
= 91+91/7+13=182/20=9.1 km/h
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