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Bunuel
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 29 Jan 2021, 03:15
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5% (low)

Question Stats:

97% (01:05) correct 3% (02:08) wrong based on 68 sessions

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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 min. What is the length of the bridge?

(A) 1 km
(B) 1 2/5 km
(C) 2 km
(D) 2 1/2 km
(E) 3 km
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B
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 29 Jan 2021, 03:42
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Distance = Speed * Time
You need to convert the denominator to the same units. Minutes in this case.

12/60 * 12 = 7/5 = 1 2/5 km
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imeanup
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 29 Jan 2021, 10:52
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\(D = S*T = 12*\frac{7}{60}=\frac{7}{5}=1\frac{2}{5}\) km

Ans B
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 20 Mar 2021, 05:13
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 min. What is the length of the bridge?

This question tests units of measurement. It's 'easy' to write numbers and think it's clear in your head, but it's important to be unmistakeable with units used

Speed·Time=Distance
\(\frac{12km}{1 hour}·7 mins=Distance\) (distance should be in kilometres)
\(\frac{12km}{60 mins}·7 mins=Distance\)
\(\frac{12km·7 mins}{60 mins}=Distance\)
\(\frac{12km·7}{60}=Distance\)
\(1\frac{2}{5}=Distance\)
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A man riding on a bicycle at a speed of 12 km/h crosses a bridge in 7 20 Mar 2021, 05:52
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The question tests on the fundamentals of Rate(Speed/Time)

Solution:

Distance = Speed x Time

Length of the bridge = Distance covered

=> Length of the bridge = 12 * (7/10) km

= 7/5 km

=1 2/5 km (option b)

Hope this helps :thumbsup:
Devmitra Sen (GMAT Quant Expert)
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