# A motor car starts with a speed of 70 kmph with its speed increasing for every two hours

A motor car starts with a speed of 70 kmph with its speed increasing for every two hours by 10 The time taken to cover 360 kms is

- 4 hours 20 minutes
- 4 hours 30 minutes
- 4 hours 40 minutes
- 4 hours 50 minutes

**Answer: (3) 4 hours 40 minutes **

**Solution:-**

Distance covered in first 2 hours = (70 x 2) km = 140 km

Distance covered in next 2 hours = (80 x 2) km = 160 km

Remaining distance = 360 – (140 + 160) = 60 km.

Speed in the fifth hour = 90 km/hr

Time taken to cover 60 km =(60/90) hr = (2/3) hr

Therefore Total time taken = 2 + 2 + (2/3) = 4 (2/3)hrs

Then, the time taken to cover 360 kms is 4 hours 40 minutes.

Hence, the correct answer is option (3) 4 hours 40 minutes.