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

Q: Problem: a train 800 m long can cross a pole in 10 sec and then find the speed of the train ?

A: 28
****
Q: Problem: a can do a work in 15 days and b in 20 days . if they work on it together for 7 days , then the fraction of the work that is left is

A: 11 / 6
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Q: Problem: a train passes a platform in 44 seconds . the same train passes a man standing on the platform in 20 seconds . if the speed of the train is 54 km / hr , the length of the platform is

A:
360
****