Homework Help: Math

Posted by Angie on Saturday, January 17, 2009 at 3:39pm.

Toni rows a boat 4.5 km/h upstream and then turns around and rows
5.5 km/h back downstream to her starting point. If her total rowing
time is 48 min, for how long does she row upstream? you can express
your answer to the nearest minute.

I don't understand how you solve it.

Math - Reiny, Saturday, January 17, 2009 at 4:23pm
let Toni's time rowing upstream be t hours, then his time rowing downstream is
.8-t hours (48 min = .8 hours)

distance upstream = 4.5t
distance downstream = 5.5(.8-t)

but the distance is the same either way, so...
4.5t = 5.5(.8-t)

solve for t

your t will be in hours, so multiply the value of t by 60 and round off.

( I got 26 minutes)
Math - Angie, Monday, January 19, 2009 at 4:32pm
thanks!!!!!!!

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