Question

A car takes 5 hours to reach a destination by travelling at the speed of 60 km/hr. How long will it take when the car travels at the speed of 75 km/hr?

Answer 1

More the speed of car, lesser the time required. So, it is an inverse proportion. 

Let the required time be x hours.

⇒ 5 × 60 = 75 × x

⇒ x = \(\frac{5\,\times\,60}{75}\) = 4 hours