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A train covered a certain distance with a speed of $$120\ \text{km/hr}$$ in 40 minutes. If the speed of the train is increased to $$150\ \text{km/hr}$$, then how much less time it will take to cover the same distance?
The distance is $$120 \times \frac{40}{60} = 80\ \text{km}$$. At $$150\ \text{km/hr}$$, the time taken is $$\frac{80}{150} \times 60 = 32$$ minutes. So the train takes $$40 - 32 = 8$$ minutes less.
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