Question 799112: Jeff can bike to work in ¾ of an hour. When he takes the bus, the trip takes 15 minutes. If the bus takes the same route and travels 20 miles per hour faster than Jeff rides his bike, what is the speed of the bus?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Jeff can bike to work in ¾ of an hour. When he takes the bus, the trip takes 15 minutes. If the bus takes the same route and travels 20 miles per hour faster than Jeff rides his bike, what is the speed of the bus?
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Biking DATA:
time = 3/4 hour ; rate = r mph ; distance = (3/4)r miles
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Bussing DATA:
time = 1/4 hour ; rate = r+20 mph ; distance = (1/4)(r+20) miles
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Equation:
(3/4)r = (1/4)r + 5
(1/2)r =5
r = 10 mph
r+20 = 30 mph (speed of the bus)
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Cheers,
Stan H.
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