Question

If the speed of Car is 50 kmph. If its speed is decreased by 10% after every hour then how much distance it will cover in 3 hours?
1. 131.5 kms
2. 130.5 kms
3. 130 kms
4. 135.5 kms
5. None of these

Answer 1

Correct Answer - Option 4 : 135.5 kms

GIVEN:

⇒ Speed of Car is 50 kmph

⇒ Time = 3 hrs.

CALCULATION:

⇒ Speed of Car in 1st hour = 50 kmph

⇒ After every hour speed = -10%

⇒ Speed in 2nd hour = (90/100) x 30 = 45 kmph

⇒ Speed in 3rd hour = (90/100) x 45 = 40.5 kmph

Adding all,

⇒ Total distance = 135.5 kms.