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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?


  1. 2 hours

  2. 3 hours 20 minutes

  3. 4 hours 40 minutes

  4. 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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