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Que: If the speed limit along a 30-mile section of rail track is reduced from...........

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by Max@Math Revolution » Sun Jun 13, 2021 9:30 pm

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Que: If the speed limit along a 30-mile section of rail track is reduced from 30 miles per hour to 15 miles per hour. Approximately how many minutes more will it take a rail to travel along this section with the new speed limit than it would have taken at the old speed limit?

A) 30
B) 40
C) 45
D) 60
E) 120
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Re: Que: If the speed limit along a 30-mile section of rail track is reduced from...........

by Max@Math Revolution » Mon Jun 14, 2021 9:35 pm
Solution: Speed * Time = Distance

Length of the section = 30 miles

Original speed limit: 30 miles per hour

Thus, time taken to cover this distance = \(\frac{30}{30}\) = 1 hour

New speed limit: 15 miles per hour

Thus, time taken to cover this distance = \(\frac{30}{15}\) = 2 hour

Thus, the required difference between the time durations is given = 2-1 = 1 hour = 1 * 60 = 60 minutes

D is the correct answer.

Answer D
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