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Phil is making a 40-kilometer canoe trip. If he travels at 3

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Carcass
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Phil is making a 40-kilometer canoe trip. If he travels at 3 [#permalink] New post   06 Aug 2018, 08:26
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Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes longer will it take him than if he makes the entire trip at 20 kilometers per hour?



A. 15

B. 20

C. 35

D. 45

E. 50
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Re: Phil is making a 40-kilometer canoe trip. If he travels at 3 [#permalink] New post   06 Aug 2018, 10:27
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Carcass wrote:
Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes longer will it take him than if he makes the entire trip at 20 kilometers per hour?



A. 15

B. 20

C. 35

D. 45

E. 50


Total Time taken for covering the distance at 20km/hr for the entire distance = 4020=2hr=120minutes

Now for the 1st 10 kms

Time taken for covering the distance at 30 km/hr = 1030=13hr=20minutes


Now for the 2nd 30 kms

Time taken for covering the distance at 15 km/hr = 3015=2hr=120minutes

So total time taken in this breakup journey = 120+20=140minutes.

Therefore extra time taken = 140−120=20minutes
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Phil is making a 40-kilometer canoe trip. If he travels at 3 [#permalink] New post   11 Jul 2019, 06:16
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Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes longer will it take him than if he makes the entire trip at 20 kilometers per hour?



A. 15

B. 20

C. 35

D. 45

E. 50
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Re: Phil is making a 40-kilometer canoe trip. If he travels at 3 [#permalink] New post   11 Jul 2019, 08:59
1
Carcass wrote:
Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes longer will it take him than if he makes the entire trip at 20 kilometers per hour?

Speed = Dist/Time

First Trip:
10kms | 30kms
|------------|------------------------------|
30kms/hr | 15km/hr
Therefore total time taken in hrs = 10/30 +30/15 = 7/3 hrs = 140 mins


Second Trip:
40kms
|----------------------------------------|
20km/hr
therefore, total time in hrs = 40/20 = 2hrs = 120 mins


Difference = 20 mins


A. 15

B. 20

C. 35

D. 45

E. 50
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Re: Phil is making a 40-kilometer canoe trip. If he travels at 3 [#permalink]
11 Jul 2019, 08:59
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