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QUIZ1 [#permalink] New post 03 Dec 2018, 11:29
A student rides his bike 7 miles from his house to school within 40 minutes, if he increases his velocity by 20 percent. when would he return home after class?
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Re: QUIZ1 [#permalink] New post 03 Dec 2018, 12:13
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Re: QUIZ1 [#permalink] New post 10 Dec 2018, 12:28
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A student rides his bike 7 miles from his house to school within 40 minutes, if he increases his velocity by 20 percent. when would he return home after class?

40 min = 2/3 hour
V1 = 7/ 2/3=21/2 = 10.5 miles/hr
V2 = 120/100 x 10.5 = m/hr

Distance 1 (from house to school) = Distance 2( after school ride) = 7 miles
V1 x T1 = V2 x T2 = 7
10.5 x 2/3 = 12.6 x T2
T2 = .56 hr (app.) = 30 minutes ( approximately)

Hope that helps
Re: QUIZ1   [#permalink] 10 Dec 2018, 12:28
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