Question

Excluding the halts, the speed of the bus is 50 km/ hr and including the halts it is 40 km/hr. For how many minutes does the bus stop per hour?

• A. 12
• B. 10
• C. 15
• D. 11

Answer 1

The Correct Option is A

Step 1: Find the speed drop.
The average speed falls from 50 km/hr to 40 km/hr, a drop of \( 50 - 40 = 10 \) km/hr.

Step 2: Apply the stoppage-time formula.
Stoppage per hour \( = \frac{\text{drop in speed}}{\text{speed without halts}} \times 60 = \frac{10}{50} \times 60 \).

Step 3: Work out the minutes.
\( \frac{10}{50} \times 60 = 12 \) minutes. \[ \boxed{12} \]