A car covers a distance of 15 km in 15 minutes. If its speed is decreased by 10 km/h, then the time taken by it to cover the distance of 20 km will be-

Question: A car covers a distance of 15 km in 15 minutes. If its speed is decreased by 10 km/h, then the time taken by it to cover the distance of 20 km will be-

Solution:
Given,
15 minutes covers 15 km
∴ 1 minutes = 15/15 km
= 1 km
∴ 60 minutes or 1 hours = (1 × 60) km
= 60 km

If its speed is decreased by 10 km/h
Then new speed = (60 - 10) km
= 50 km/h

∴ 1 km cover in (60 ÷ 50) minutes
= 6/5 minutes
∴ 20 km cover in = (6/5 × 20) minutes
= 24 minutes