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Question

If Suresh travels 13rd of a certain distance by car at the speed of 60 km/hr and the rest of the distance by bike at the speed of 30 km/hr, then find his average speed for the whole journey.

A
45 km/hr
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B
50 km/hr
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C
36 km/hr
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D
40 km/hr
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Solution

The correct option is C 36 km/hr
Let the total distance covered by Suresh be 3D km.

So, time taken to travel13rd of the distance =D60hours

Time taken to travel remaining 23rd of the distance 2D30

Total time taken to travel 3D km=D60+2D30=D12 hours.

Required average speed= Total DistanceTotal time taken=3DD12=3×12=36km/hr.

Hence, option C is the correct answer.

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