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= TotalDistanceTotaltimetaken=3DD12=3×12=36km/hr.