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# A can dig land at a uniform rate of 60 feet every 30 minutes

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Joined: 25 Dec 2018
Posts: 145
Location: India
GMAT 1: 490 Q47 V13
GPA: 2.86
A can dig land at a uniform rate of 60 feet every 30 minutes  [#permalink]

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03 Jan 2019, 09:26
1
2
00:00

Difficulty:

15% (low)

Question Stats:

84% (02:04) correct 16% (01:33) wrong based on 39 sessions

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A can dig land at a uniform rate of 60 feet every 30 minutes, whereas along with B he would take 40 minutes to dig every 200 feet. How much time would B alone take to dig 120 feet?

A. 40 Minutes
B. 60 Minutes
C. 80 Minutes
D. 100 Minutes
E. 120 minutes
General GMAT Forum Moderator
Joined: 15 Jan 2018
Posts: 603
Concentration: General Management, Finance
GMAT 1: 720 Q50 V37
Re: A can dig land at a uniform rate of 60 feet every 30 minutes  [#permalink]

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03 Jan 2019, 09:40
4
A can dig land at a uniform rate of 60 feet every 30 minutes, i.e. A can dig 60/30 = 2 feet per minute.
Together A & B can dig 200 feet in 40 minutes, i.e. A + B can dig 200/40 = 5 feet minute
Therefore, B alone can dig (5 - 2) = 3 feet per minute

Since 3 feet take 1 minute to dig, 120 feet would take 120/3 = 40 minutes.

Hence, the Correct Answer is Option A. 40 minutes

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Re: A can dig land at a uniform rate of 60 feet every 30 minutes   [#permalink] 03 Jan 2019, 09:40
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# A can dig land at a uniform rate of 60 feet every 30 minutes

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