Question

Ram covers a part of the journey at 20 kmph and the balance at 70 kmph taking the total of 8 hours to cover the distance of 400 km. how many hours has been driving at 20 kmph?

Answer 1

20t + 70(8-t) = 400
t = 160/50
t= 3.2 hr

Answer 2

Answer: 3 hours 12 minutes

Explanation:

Let x be the number of hours he travels at 20 km/h.

Distance covered in this x hours = 20x km

He would have therefore, traveled the balance (8 - x) hours at 70 km/h.

Distance covered in this (8 - x) hours = (8 - x) * 70 = (560 - 70x) km

The total distance traveled = 20x + 560 - 70x = 400

=> 160 = 50 x

=> x = (160/50) hours

=> 3.2 hours

=> 3 hours and 12 minutes

Hope it helps,

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