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Before Race R,which is 1,500 meters, Peter's best time in swimming

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Before Race R,which is 1,500 meters, Peter's best time in swimming  [#permalink]

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New post 16 Apr 2018, 08:02
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  25% (medium)

Question Stats:

80% (01:56) correct 20% (01:16) wrong based on 50 sessions

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Before Race R,which is 1,500 meters, Peter's best time in swimming was 21 minutes. Did Peter beat this time in Race R ?

1) Peter took between 0.3 and 0.4 hours to swim 1,500 meters in Race R.
2) Peter took between 1,200 and 1,300 seconds to swim 1,500 meters in Race R.

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Re: Before Race R,which is 1,500 meters, Peter's best time in swimming  [#permalink]

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New post 19 Apr 2018, 10:17
itisSheldon wrote:
Before Race R,which is 1,500 meters, Peter's best time in swimming was 21 minutes. Did Peter beat this time in Race R ?

1) Peter took between 0.3 and 0.4 hours to swim 1,500 meters in Race R.
2) Peter took between 1,200 and 1,300 seconds to swim 1,500 meters in Race R.


21 minutes in hours is equal to = 21/60 or 7/20 or 0.35 hours
21 minutes in seconds is equal to = 21*60 = 1260 seconds

We need to know whether peter finished this race R in less than 21 minutes, or in less than 0.35 hours, or in less than 1260 seconds - or not?

(1) Between 0.3 and 0.4 hours, but this could be above or below 0.35. Not sufficient.

(2) Between 1200 and 1300 seconds, but this could be above or below 1260. Not sufficient.

Combining the statements, 0.3 hours is 0.3*3600 = 1080 seconds and 0.4 hours = 0.4*3600 = 1440 seconds. So as per the first statement, his race time is between 1080 and 1440 seconds and as per the second statement, his race time is between 1200 and 1300 seconds. This tells us that the common time value from both statements is between 1200 and 1300 seconds only. Still not sufficient to know whether its less or more or equal to 1260 seconds.

So E answer
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Re: Before Race R,which is 1,500 meters, Peter's best time in swimming  [#permalink]

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New post 30 Apr 2018, 19:38
I) as per statement (0.3*60 0.4*60)
Between 18 and 24 minutes so insufficient

II)1200/60 1300/60
Be 20 and 21.6 minutes so insufficient

Even after combining we get range from 20 to 21.6 minutes so answer is E

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Re: Before Race R,which is 1,500 meters, Peter's best time in swimming &nbs [#permalink] 30 Apr 2018, 19:38
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Before Race R,which is 1,500 meters, Peter's best time in swimming

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