Question 462476
(63+x)*t=150
t=150/(63+x)
(63-x)*t=120
t=120/(63-x)
150/(63+x)=120/(63-x)
120*(63+x)=150*(63-x)
x=7 mph current
BTW t=15/7
(63+7)*15/7=150
10*15=150
ok
(63-7)*15/7=120
56/7*15=120
8*15=120
ok