Question

A car travels 50 km in 2 $\frac{1}{2}$ hours. How much time is required to cover 30 km with the same speed?

• A. 50 minutes
• B. 90 minutes
• C. 70 minutes
• D. 2 hours

Answer 1

The correct option is B 90 minutes

In this case, time is unknown and distance is known. Therefore, we proceed as follows :
2 $\frac{1}{2}$ hours = $\frac{5}{2}$ hours = $\frac{5}{2}$ × 60 minutes = 150 minutes.
50 km is covered in 150 minutes
Therefore, 1 km can be covered in
$\frac{150}{50}$ = 3 minutes
Therefore, 30 km can be covered in
3 × 30 minutes i.e. 90 minutes
Thus, 30 km can be covered in 90 minutes.