Question

Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. For how many minutes does the bus stop per hour?

• A. 12
• B. 10
• C. 9
• D. 20

Answer 1

Answer: (B)

10

Answer 2

Time taken including stoppages be t and without stoppages be x.
d = $54 \times x$
d = $45\times t$
\Rightarrow \;$$54x = 45t
\Rightarrow \;$$\frac{x}{t} = \frac{5}{6}
Let $t$ be 1 hr = 60 minutes,
x = 50 minutes (from above equation)
So, stoppage per hour = 10 minutes.

The correct option is (B): 10