SOLUTION: a brother and sister left their house at the same time. The brother headed east on his bike riding 13 miles per hour. The sister headed west on her skateboard riding 5 miles per
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Question 259022: a brother and sister left their house at the same time. The brother headed east on his bike riding 13 miles per hour. The sister headed west on her skateboard riding 5 miles per hour. How long will it take them to be 9 miles apart?
Found 2 solutions by richwmiller, rfer:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
13*t+5*t=9
(13+5)*t=9
18t=9
t=1/2hour
check
5*.5+13*.5=
2.5+6.5=9 miles
ok
Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
moving apart at 18 mph
9/18=.5 or 30 min
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