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Minnie rides on a flat road at 20 kilometers per hour (kph), downhill

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Math Expert
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Joined: 02 Sep 2009
Posts: 55720
Minnie rides on a flat road at 20 kilometers per hour (kph), downhill  [#permalink]

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New post 10 May 2019, 00:31
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

38% (03:35) correct 63% (03:23) wrong based on 40 sessions

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Minnie rides on a flat road at 20 kilometers per hour (kph), downhill at 30 kph, and uphill at 5 kph. Penny rides on a flat road at 30 kph, downhill at 40 kph, and uphill at 10 kph. Minnie goes from town A to town B, a distance of 10 km all uphill, then from town B to town C, a distance of 15 km all downhill, and then back to town A, a distance of 20 km on the flat. Penny goes the other way around using the same route. How many more minutes does it take Minnie to complete the 45-km ride than it takes Penny?

(A) 45

(B) 60

(C) 65

(D) 90

(E) 95

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Director
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Joined: 19 Oct 2018
Posts: 503
Location: India
Re: Minnie rides on a flat road at 20 kilometers per hour (kph), downhill  [#permalink]

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New post 10 May 2019, 04:10
Total time taken by M- [(10/5)+(15/30)+(20/20)]*60=210 minutes
Total time taken by P- [(20/30)+(15/10)+(10/40)]*60=145 minutes
Difference=210-145=65 minutes
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Re: Minnie rides on a flat road at 20 kilometers per hour (kph), downhill  [#permalink]

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New post 20 May 2019, 17:52
Can this really be done in 2 mins? 17 sessions, average correct time is 4:15. Personally I spent at about 1:30 just setting up the problem
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Re: Minnie rides on a flat road at 20 kilometers per hour (kph), downhill   [#permalink] 20 May 2019, 17:52
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Minnie rides on a flat road at 20 kilometers per hour (kph), downhill

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