Posted by Kara on Wednesday, October 26, 2011 at 1:10am.
recall that rate is just distance travelled over time, or
v = d/t
let x = time required for them to meet
thus since they are paddling toward each other, we add their rates and multiply it by the time required and equate this distance to 33:
(4 + 7)x = 33
11x = 33
x = 3 hours
hope this helps~ :)
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