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

Input: Consider Input: Problem: a and b are 90 km apart they start to move each other simultaneously a at speed 10 and b at 5 km / hr if every hour they double their speed what is distance that a pass until he meet b ?

Output: 60 km


Input: Consider Input: Problem: a sum of money at simple interest amounts to rs . 815 in 3 years and to rs . 878 in 4 years . the sum is :

Output: 626


Input: Consider Input: Problem: the perimeter of a rhombus is 68 cm and one of its diagonals is 16 cm . find its area ?


Output: 240