Question

# John covers a part of the journey at 20kmhr and the remaining at 70kmhr, taking total of 8 hours to cover the distance of 400 km. How many hours he has been driving at 70kmhr? 2 hours 3 hours 20 minutes 4 hours 40 minutes 3 hours 12 minutes

Solution

## The correct option is D 3 hours 12 minutes Let the total time that he travelled with a speed of 20kmhr be x hours. So, at 70kmhr  he travelled for 8-x hours. So,  20x + 70(8-x) =400 The total distance traveled = 20x + 560 - 70x = 400 50x = 160 x = 3.2 hrs i.e. 3 hours 12 minutes.

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