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July 28, 2014

July 28, 2014

Posted by **wan** on Saturday, March 16, 2013 at 7:06am.

- math -
**Reiny**, Saturday, March 16, 2013 at 7:28amtime to go home at 40 km/h --- d/40 hours

time to go home at 60 km/h --- d/60 hours

d/40 - d/60 = 2 (there is a 2 hr difference in the two times)

time 120

3d - 2d = 240

d = 240

so the two times are 240/40 and 240/60

or 6 and 4 hours,

so he wants to take 5 hours

speed = 240/5 = 48 km/h

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