My guess is 9 hours, because since pipe a takes 12 hours and with pipe b it takes 9, it's 12-9=3
I think.
7.6 miles is the answer because 1.2+1.9+0.7=3.8
Now he went the same way so 3.8x2 which equals 7.6.
1 meter - 100 cm
14 x 100 = 1400 cm per second
60 seconds per minute
1400 * 60 = 84,000 cm per minute
Your answer would be -8 because your multiplying 4 times negative 2