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

Problem: a bullet train covers a distance in 50 min , if it runs at a speed of 48 kmph on an average . the speed at which the bullet train must run to reduce the time of journey to 40 min will be .
60 kmph

Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
180 meter

Problem: ashok secured average of 72 marks in 6 subjects . if the average of marks in 5 subjects is 74 , how many marks did he secure in the 6 th subject ?
62