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
Que: If the speed limit along a 30-mile section of rail track is reduced from...........
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- Max@Math Revolution
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B
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E
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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
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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