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July 25, 2014

July 25, 2014

Posted by **Jessica** on Friday, October 8, 2010 at 6:59am.

- word problem -
**Reiny**, Friday, October 8, 2010 at 8:23amspeed of current ---- x km/h

speed against current --- 15-x

speed with current ----- 15+x

time against current = 35/(15-x)

time with current = 35/(15+x)

so solve

35/(15-x) + 35/(15+x) = 4.8

(I suggest multiplying each term by (5+x)(15-x), you will end up with a quadratic equation )

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