A train covers a distance of 12 km in 25 minutes. If its speed is decreased by 5 km/hr, then the time (in minutes) taken by it to cover the same distance will be:

Correct option is D

Given:

Distance = 12 km
Time taken at original speed = 25 minutes $$= \frac{25}{60}$$​ hours

Formula Used:

Time =$$\frac{\text{Distance}}{\text{Speed}}$$​

Solution:

Original speed =$$\frac{12}{\frac{25}{60}} = \frac{12 \times 60}{25}$$​= 28.8 km/h

Reduced speed = 28.8 - 5 = 23.8 km/h

New time $$= \frac{12}{23.8} \text{ hours} = \frac{12 \times 60}{23.8} \text{ minutes} \approx 30.25 \text{ minutes}$$ = $$30\frac{30}{119}$$ minutes​