Posted by **Kelvin** on Thursday, March 31, 2011 at 11:48am.

a boat moves through still wather at x kilometers(km) per hour. it travels 24km up stream against a current of 2km per hour and then returns with the current. The rate upstream is x-2 because the boat moves against the current and the rate downstream is x+2 because the boat moves with the current.

36.write an expression for the total time for the round trip.

37.write your answer to exercise 36 as a single rotional expression.

28.use your answer to exercise 37 to find how long the round trip will take if the boat travels 10kilometers per hour through still water

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