1. The distance between two cities is 30 Km. A man goes at a speed of 30 Km per hour and returns at 20 Km per hour. What is his average speed
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By: anil on 05 May 2019 01.49 am
Total distance between cities = 30 km Using, time = distance/speed Time taken when speed is 30 kmph = $$frac{30}{30}=1$$ hour Similarly, time taken in the return journey = $$frac{30}{20}=1.5$$ hours $$ herefore$$ Average speed = total distance/total time = $$frac{30+30}{1+1.5}=frac{60}{2.5}$$ = $$24$$ km/hr => Ans - (B)
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