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

[EX Q]: Problem: at what rate percent on simple interest will rs . 750 amount to rs . 900 in 8 years ?
[EX A]: 2.5 %

[EX Q]: Problem: a man rows his boat 110 km downstream and 90 km upstream , taking 3 hours each time . find the speed of the stream ?
[EX A]: 3.5

[EX Q]: Problem: a train traveling at 72 kmph crosses a platform in 35 seconds and a man standing on the platform in 18 seconds . what is the length of the platform in meters ?
[EX A]:
340 meters