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

[EX Q]: Problem: what is the dividend . divisor 13 , the quotient is 17 and the remainder is 1
[EX A]: 222

[EX Q]: Problem: the distance between a & b is 1540 km . a person is traveling from a to b at 100 km / hr started at 6 am and another person is traveling from b to a at 120 km / hr and started at same time . then at what time they meet together .
[EX A]: 1 pm

[EX Q]: Problem: before 7 years , dog a ’ s age was 4 times of dog b ’ s age and after 4 years , dog a ’ s age will be 3 times of dog b ’ s age . what is the difference of dog a ’ s age and dog b ’ s now ?
[EX A]:
7