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Keep Cool Air-Conditioning charges $ 60 for the first 30 min

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Keep Cool Air-Conditioning charges $ 60 for the first 30 min [#permalink] New post   29 Jul 2020, 10:35
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Keep Cool Air-Conditioning charges $ 60 for the first 30 minutes of every house call and $ 15 for each additional quarter hour. In addition, the customer has to pay for any required parts needed for repairs. If Mrs. Lewis’s bill was $ 225, which included $ 90 for parts, how long did the air-conditioning repair technician work?

A. 1 hour and 15 minutes

B. 1 hour and 45 minutes

C. 2 hours

D. 2 hours and 15 minutes

E. 3 hours



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rishabhrbs96
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Re: Keep Cool Air-Conditioning charges $ 60 for the first 30 min [#permalink] New post   29 Jul 2020, 10:57
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If we remove $90 for parts and $60 for first 30 minutes,
Mrs. Lewis has paid 225 - 90 - 60 = $75 for additional quarters.
Since, each additional quarter cost him $15, no. of additional quarter = 75/15 = 5
=> time in minutes = 30 + 5*15 = 105 minutes or 1 hour 45 minutes.

So, the answer is B.
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Re: Keep Cool Air-Conditioning charges $ 60 for the first 30 min [#permalink] New post   03 Feb 2021, 01:13
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Total Charge = 60 (for first 30 mins) + 15 (for every 15 minutes) + Charge for Parts
Let, the number of Quarter-hours required be X

So, 225 = 60 + 15X + 90
Solve for X = 5

Therefore, total time = 30 minutes (initial) + 15 x 5 minutes = 105 minutes = 1 hour and 45 minutes
So, Option B
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Keep Cool Air-Conditioning charges $ 60 for the first 30 min [#permalink] New post   19 Sep 2021, 21:55
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Keep Cool Air-Conditioning charges $ 60 for the first 30 min [#permalink]
19 Sep 2021, 21:55
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