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March 4, 2015

March 4, 2015

Posted by **Babiinoob** on Thursday, October 6, 2011 at 7:52pm.

How long will it take the boat to make the return trip downstream? (Assume the boat retains the speed travelled upstream)

Working out please

- Maths -
**Steve**, Friday, October 7, 2011 at 5:45amu = boat speed

u-3 = upstream speed

u+3 = downstream speed

distance = speed * time

35 = (u-3) * 5/6

210 = 5u - 15

225 = 5u

45 = u

downstream,

35 = 48 * t

t = 35/48

t = 0.729 hr = 43min 45 sec

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