A train covers a distance of 10 km in 12 minutes. If its speed isdecreased by 5 km /hr, the time taken by it to cover the same distance is equal to

A train covers a distance of 10 km in 12 minutes. If its speed isdecreased by 5 km /hr, the time taken by it to cover the same distance is equal to
1). 40 minutes
2). $\frac{40}{3}$ minutes
3). 20 minutes
4). 15 minutes

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