50 min
step-by-step explanation:
they will be decreasing both their times in half
60 / 2 = 30
40/2 = 20
30 + 20 = 50
the answer is 0.3175 hope that you ^w^
also you might actually want to put this picture up if you want people to solve it luckily i remember this question
did you get the answer yet?