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: the curved surface of a sphere is 64 π cm 2 . find its radius ?

Output: 4', 'd ) 9', 'e ) 7'


Input: Consider Input: Problem: a 270 metres long bullet train running at the speed of 120 kmph crosses another bullet train running in opposite direction at the speed of 80 kmph in 9 seconds . what is the length of the other bullet train ?


Output: 230