Homework Help: Math

Posted by Erin on Thursday, December 6, 2012 at 8:22pm.

How do you set this up?
Solve the system using substitution:
A boat travels 18 miles downstream in 1.5 hrs. It then takes the boat 3 hrs. to travel upstream the same distance. Find the speed of the boat in still water and the speed of the current.

Thanks you!!!

Math - Steve, Thursday, December 6, 2012 at 11:29pm
if the boat's speed is b, and the current is c,

distance = time * speed

1.5(b+c) = 18
3(b-c) = 18

now go solve 'em.
Math - Kate, Friday, December 7, 2012 at 6:43am
Thank you for your help!

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