The task is to generate the correct answer for a given math problem.

[Q]: Problem: a train covers a distance of 12 km in 10 minutes . if it takes 8 seconds to pass a telegraph post , then the length of the train is
[A]: 160 m


[Q]: Problem: a retailer buys 80 pens at the market price of 36 pens from a wholesaler , if he sells these pens giving a discount of 1 % , what is the profit % ?
[A]: 12


[Q]: Problem: the speed at which a man can row a boat in still water is 150 kmph . if he rows downstream , where the speed of current is 48 kmph , what time will he take to cover 390 metres ?
[A]:
13