Question

Excluding stoppages, the speed of a train is $45$ km/hr and including stoppages it is $36$ km/hr. For how many minutes does the train stop per hour?

• A. $10$
• B. $12$
• C. $15$
• D. $18$

Answer 1

Answer: (B)

$12$

Due to stoppages the train travels $(45-36)=9$ km less in 1 hour and the time taken to travel 9 km is the time taken at the stoppages.
$\therefore$ Time taken to cover 9 km at 45 km/hr $=\frac{9}{45}\times 60=12min$.