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

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

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New post 23 Jul 2011, 14:53
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Question Stats:

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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
[Reveal] Spoiler: OA

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Re: The consumption of diesel per hour of a bus varies directly as square [#permalink]

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New post 23 Jul 2011, 17:05
Answer C.

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

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Manager
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Re: The consumption of diesel per hour of a bus varies directly as square [#permalink]

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New post 23 Jul 2011, 23:03
agdimple333 wrote:
Answer C.

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?

Kudos [?]: 117 [0], given: 8

Manager
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Joined: 25 Jan 2010
Posts: 109

Kudos [?]: 241 [0], given: 40

Location: Calicut, India
Re: The consumption of diesel per hour of a bus varies directly as square [#permalink]

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New post 25 Jul 2011, 18:10
zuberahmed wrote:
agdimple333 wrote:
Answer C.

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