Question

A car takes 6 hours to reach a destination by travelling at a speed of 50 km per hour. How long will it take when the car travels at a speed of 75 km per hour?

Answer 1

Time: Distance:: Time: Distance

    6  :    50 km ::    x   :    75

∴ By inverse proportion

6 × 50 = x × 75

`⇒"x"=(50xx6)/75`

= 4 hours