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On a 60 km straight road, …

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On a 60 km straight road, a bus travels the first 30 km with a uniform speed of 30 kmh-1. How fast must the bus travel the next 30 km so as to have average speed of 40 kmh-1 for the entire trip?

Posted by Preksha Chandrakar 3 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Prince Yadav 3 years, 4 months ago

Avg speed of entire trip - V and total distance d=60Km and total time taken is t. Avg speed in first 30Km _ v1=30Kmh-1 and time taken to cover it is t1. Avg speed in last 30Km _ v2=? and time taken to cover it is t2. V = d/t V = 60/(t1+t2) V = 60/[(30/v1)+(30/v2)] 40 = 60/[(30/30)+(30/v2)] (30/30)+(30/v2) = 60/40 = 1.5 1 + (30/v2) = 1.5 30/v2 =0.5 v2 = 30/0.5 v2 = 60 Kmh-1

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