Question

A car is travelling at an average speed of 60 km per hour. How much distance will it cover in 1 hour 12 minutes? 

A. 50 km 

B. 72 km 

C. 63 km 

D. 67.2 km

Answer 1

Average Speed = \(\frac{Total\,Distance}{Total\,Time}\)

Let distance be x km, time = \((1+\frac{12}{60})\) hr = \((1+\frac{1}{5})\) hr = \(\frac{6}{5}\) hr

⇒ 60 km/hr = \(\frac{\frac{x}{6}}{5}\)

⇒ x = 60 × \(\frac{6}{5}\) = 72 km