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Driving at a constant speed of 60/mph, Bob can reach his wor
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02 Oct 2017, 22:29
02 Oct 2017, 22:29
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Question Stats:
45% (01:08) correct
54% (01:20) wrong based on 51 sessions
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Driving at a constant speed of 60/mph, Bob can reach his work in 15 min. If he wants to reach work three minutes faster, by how many miles per hour must he increase his speed?
(A) 12 mph
(B) 15 mph
(C) 20 mph
(D) 75 mph
(E) 80 mph
Kudos for correct solution.
(A) 12 mph
(B) 15 mph
(C) 20 mph
(D) 75 mph
(E) 80 mph
Kudos for correct solution.
Re: Driving at a constant speed of 60/mph, Bob can reach his wor
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03 Oct 2017, 04:40
03 Oct 2017, 04:40
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Using the usual formula \(speed = \frac{distance}{time}\), the distance to work is computed as \(60*\frac{1}{4} = 15\), where 1/4 is 15 minutes in hours.
Then, if we want to reach work in 3 minutes less, it would take 12 minutes or 1/5 hours to get to work. Thus, the speed should be \(15*5 = 75\). Thus, he needs to go 15 mph faster.
Answer B
Then, if we want to reach work in 3 minutes less, it would take 12 minutes or 1/5 hours to get to work. Thus, the speed should be \(15*5 = 75\). Thus, he needs to go 15 mph faster.
Answer B
Re: Driving at a constant speed of 60/mph, Bob can reach his wor
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03 Dec 2019, 20:51
03 Dec 2019, 20:51
1
the answer should be 75 mph so its D
