Rahul covers a part of the journey at 20 km/hr and the remaining at 70 km/hr, taking total of 8 hours to cover the distance of 410 km. How many hours he has been driving at 20 km/hr?

4hours

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2hours

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8hours

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3hours

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Solution

The correct option is D
3hours

Let the total time he travelled with a speed of 20 km/hr is x hr.

So at 70 km/hr he travelled for = (8-x)hr

$d i s t a n c e = s p e e d \times t i m e$

So, 20x + 70(8-x) =400

The total distance traveled = 20x + 560 - 70x = 410

50x = 150

x = 3 hrs

i.e. 3 hours

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