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

Q: Problem: the sum of ages of 5 children born 1 years different each is 30 years . what is the age of the elder child ?

A: 8
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Q: Problem: if 1.5 cm of a pencil is purple , 0.5 cm of the remaining is black and the remaining 2 cm is blue , what is the total length of the pencil ?

A: 4 cm
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Q: Problem: two trains travel in opposite directions at 36 kmph and 45 kmph and a man sitting in slower train passes the faster train in 8 seconds . the length of the faster train is

A:
100 m
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