two mechanics were working on your car . one can complete the given job in 4 hours , but the new guy takes eight hours . they worked together for the first two hours , but then the first guy left to help another mechanic on a different job . how long will it take the new guy to finish your car ?
"rate ( 1 ) = 1 / 4 rate ( 2 ) = 1 / 8 combined = 3 / 8 work done in 2 days = 3 / 4 work left = 1 / 4 rate * time = work left 1 / 8 * time = 1 / 4 time = 2 a"
max(divide(subtract(const_1, multiply(add(divide(const_1, add(const_4, const_2)), divide(const_1, 4)), const_2)), divide(const_1, 4)), const_3)