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

[Q]: Problem: in 1950 , richard was 4 times as old as robert . in 1955 , richard was 3 times as old as robert . in which year was richard 1.5 times as old as robert ?
[A]: 200


[Q]: Problem: find the least number must be subtracted from 62575 so that remaining number is divisible by 99 .
[A]: 7


[Q]: Problem: one fast typist type some matter in 4 hrs and another slow typist type the same matter in 6 hrs . if both do combine in how much time they will take to finish .
[A]:
2 hr 24 mins