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December 19, 2014

December 19, 2014

Posted by **Sarah** on Monday, August 20, 2012 at 8:11pm.

- AlgebraII -
**Reiny**, Monday, August 20, 2012 at 8:27pmtime for 1st trip = x/40, where x is the distance between NY and Boston

time for return trip = x/60

total time = x/40 + x/60 = (60x + 40x)/2400

= 100x/2400 = x/24

so average rate = 2x/(x/24)

=2x ( 24/x)

= 48

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