Question

A car takes 2 hours to reach a destination by travelling at 60 km/hr. How long will it take while travelling at 80 km/hr? 

A. 1 hr 30 min 

B. 1hr 40 min 

C. 2hrs 40 min 

D. none of these

Answer 1

More the speed, lesser the time to travel. So, it is an inverse proportion. 

Let the required time be x hr. 

⇒ 2 × 60 = 80 × x

⇒ x = \(\frac{2\,\times\,60}{80}\) = 1.5 hours = 1hour 30 minutes