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September 21, 2014

September 21, 2014

Posted by **dawn** on Monday, March 21, 2011 at 11:02pm.

i was told this question is not complete to answer? is that true?

- math...? -
**Reiny**, Tuesday, March 22, 2011 at 7:55amnormal speed ---- x km/h

time at normal speed = 240/x hours

reduced speed --- x-20 km/h

time at reduced speed = 240/(x-20)

solve:

240/(x-20) - 240/x =1

hint: multiply each term by x(x-2)

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