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Stan drove for h hours at a constant rate of r miles per hour. How man

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Bunuel
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Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   19 Jul 2018, 23:44
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Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3
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Re: Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   19 Jul 2018, 23:50
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if speed is constant , it does not matter what distance you travel in first 20 min or last 20 min , it will be same

so hr /60 * 20 = hr/3
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Re: Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   20 Jul 2018, 02:04
Bunuel wrote:
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3


+1 for E.

Distance (D) = Speed (S) * Time (T)
S * T = r*20/60 mins = r / 3

Hence, E.
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Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   20 Jul 2018, 03:32
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20 minutes is one third of one hour.

If Stan travels r miles every hour, then he will travel one third of r miles in one third of an hour, or r/3 in 20 minutes.
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Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   22 Jul 2018, 20:56
Bunuel wrote:
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3


r[h-(h-1)]/3=r/3
E
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Re: Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   23 Jul 2018, 18:29
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Bunuel wrote:
Stan drove for h hours at a constant rate of r miles per hour. How many miles did he go during the final 20 minutes of his drive?

A. 20r
B. hr/3
C. 3rh
D. hr/20
E. r/3


We use the formula: distance = rate x time. Since 20 minutes = ⅓ hours, Stan went r x 1/3 = r/3 miles.

Answer: E
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Re: Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink] New post   22 Mar 2024, 03:33
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Re: Stan drove for h hours at a constant rate of r miles per hour. How man [#permalink]
22 Mar 2024, 03:33
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