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# The consumption of diesel per hour of a bus varies directly as square

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Manager
Joined: 25 Jan 2010
Posts: 106
Location: Calicut, India
The consumption of diesel per hour of a bus varies directly as square  [#permalink]

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23 Jul 2011, 14:53
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Difficulty:

5% (low)

Question Stats:

94% (02:09) correct 6% (02:23) wrong based on 34 sessions

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The consumption of diesel per hour of a bus varies directly as square of its speed. When the bus is travelling at 40 kmph its consumption is 1 litre per hour. if each litre costs \$40 and other expenses per hour is \$40, then what would be the minimum expenditure required to cover a distance of 400 Km?

A) 600
B) 700
C) 800
D) 900
E) 1000

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Senior Manager
Joined: 24 Mar 2011
Posts: 391
Location: Texas
Re: The consumption of diesel per hour of a bus varies directly as square  [#permalink]

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23 Jul 2011, 17:05

the problem is easy if you understand the meaning but i am still not able to understand the meaning of - The consumption of diesel per hour of a bus varies directly as square of its speed.

anyways,

40 kmph consumption is 1 lt/hr
so 400 km will take 10 hrs and the consumption is 10 lt for entire distance.

1 lt costs \$40
so 10 lt costs \$400

extra expenses for 1 hr - \$40
10 hrs - \$400

total expense - \$400 + \$400 = \$800
Manager
Joined: 14 Feb 2010
Posts: 130
Location: Banaglore
Re: The consumption of diesel per hour of a bus varies directly as square  [#permalink]

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23 Jul 2011, 23:03
agdimple333 wrote:

the problem is easy if you understand the meaning but i am still not able to understand the meaning of - The consumption of diesel per hour of a bus varies directly as square of its speed.

anyways,

40 kmph consumption is 1 lt/hr
so 400 km will take 10 hrs and the consumption is 10 lt for entire distance.

1 lt costs \$40
so 10 lt costs \$400

extra expenses for 1 hr - \$40
10 hrs - \$400

total expense - \$400 + \$400 = \$800

How do you know that the bus travels at a constant speed of 40kmph?
Manager
Joined: 25 Jan 2010
Posts: 106
Location: Calicut, India
Re: The consumption of diesel per hour of a bus varies directly as square  [#permalink]

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25 Jul 2011, 18:10
zuberahmed wrote:
agdimple333 wrote:

the problem is easy if you understand the meaning but i am still not able to understand the meaning of - The consumption of diesel per hour of a bus varies directly as square of its speed.

anyways,

40 kmph consumption is 1 lt/hr
so 400 km will take 10 hrs and the consumption is 10 lt for entire distance.

1 lt costs \$40
so 10 lt costs \$400

extra expenses for 1 hr - \$40
10 hrs - \$400

total expense - \$400 + \$400 = \$800

How do you know that the bus travels at a constant speed of 40kmph?

Since no other speed is given, we gotta assume the speed is 40kmph and is constant.
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Re: The consumption of diesel per hour of a bus varies directly as square  [#permalink]

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07 Oct 2017, 05:23
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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The consumption of diesel per hour of a bus varies directly as square &nbs [#permalink] 07 Oct 2017, 05:23
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