John travels first 20 km at 2km/hr and the next 20 km at 10 km/hr. The total time taken by him in completing the journey will be

20 hrs

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10 hrs

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40 hrs

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None of these

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Solution

The correct option is D
None of these

Time taken to cover first 20 km = Distance covered/ Speed

= $\frac{20}{2}$ = 10 hrs

Time taken to cover the next 20km = Distance covered/ Speed

= $\frac{20}{10}$ = 2 hrs

Total time taken= 10 + 2= 12 hrs

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John travels first 20 km at 2km/hr and the next 20 km at 10 km/hr. The total time taken by him in completing the journey will be

The correct option is D None of these Time taken to cover first 20 km = Distance covered/ Speed = 202 = 10 hrs Time taken to cover the next 20km = Distance covered/ Speed = 2010 = 2 hrs Total time taken= 10 + 2= 12 hrs

The correct option is D
None of these

Time taken to cover first 20 km = Distance covered/ Speed

= $\frac{20}{2}$ = 10 hrs

Time taken to cover the next 20km = Distance covered/ Speed

= $\frac{20}{10}$ = 2 hrs

Total time taken= 10 + 2= 12 hrs