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Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa

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clciotola
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Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 May 2013, 08:10
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Martha biked 18 2/3 miles in 2 hours and 40 minutes. What was her average rate of speed in miles per hour?

A. 7
B. 7 2/3
C. 8 1/3
D. 9
E. 9 1/3

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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 May 2013, 08:13
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D = 18(2/3) = 56/3

T = 2(2/3) = 8/3


S = D/T = 7
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clciotola
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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 May 2013, 08:56
SrinathVangala wrote:
D = 18(2/3) = 56/3

T = 2(2/3) = 8/3


S = D/T = 7



Ho wdo you calculate T ( T = 2(2/3) = 8/3 ) ??
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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 May 2013, 09:00
clciotola wrote:
SrinathVangala wrote:
D = 18(2/3) = 56/3

T = 2(2/3) = 8/3


S = D/T = 7



Ho wdo you calculate T ( T = 2(2/3) = 8/3 ) ??


The time is 2 hours and 40 mins. When we represent then in a fraction form in terms of hours, it would be 2 and 40/60 hours i.e. 2 and 2/3 in mixed form!

Hope it helps :)

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Arpan
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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 May 2013, 09:04
clciotola wrote:
SrinathVangala wrote:
D = 18(2/3) = 56/3

T = 2(2/3) = 8/3


S = D/T = 7



Ho wdo you calculate T ( T = 2(2/3) = 8/3 ) ??



let a(b/c) be the mixed fraction.

To convert it into a fraction. We can use this formula.

Fraction = a*c + b

Theory. :- Let D be the dividend. when D is divided by a divisor c .Let the quotient be a and the remainder b. We can write the dividend as D= a*c + b.

Its the same theory used to convert mixed fractions into proper ones
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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink] New post   17 Aug 2014, 10:13
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Re: Martha biked 18 2/3 miles in 2 hours and 40 minutes. What wa [#permalink]
17 Aug 2014, 10:13
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