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26 Apr 2017, 08:07
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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83% (01:23) correct
17%
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wrong
based on 164
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Charissa travels from home to work average speed of 60 miles per hour and from work to home at 40 miles per hour. If Charissa travels by the same route in both directions, which of the following is Charissa's average speed during her daily commute?
A. 42.1 miles per hour
B. 44.4 miles per hour
C. 45 miles per hour
D. 48 miles per hour
E. 50 miles per hour
A. 42.1 miles per hour
B. 44.4 miles per hour
C. 45 miles per hour
D. 48 miles per hour
E. 50 miles per hour
26 Apr 2017, 08:37
Kudos
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Let distance between Home and Work = D miles
Time taken to travel from Home to Work = D/60 hours
Time taken to travel from Work to Home = D/40 hours
Average Speed = Total Distance/Total Time
Average Speed = (D+D)/[(D/60)+(D/40)] = 2D/[100D/2400] = 2 * 2400/100 = 48 miles/hour
Answer is D. 48 miles per hour
Time taken to travel from Home to Work = D/60 hours
Time taken to travel from Work to Home = D/40 hours
Average Speed = Total Distance/Total Time
Average Speed = (D+D)/[(D/60)+(D/40)] = 2D/[100D/2400] = 2 * 2400/100 = 48 miles/hour
Answer is D. 48 miles per hour
26 Apr 2017, 10:02
Kudos
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Let d = 240
Then
distance = speed x time
240 = 60 x t
time = 4
distance = speed x time
240 = 40 x t
time = 6
distance = speed x time
480 = s x 10
speed = 48
Which is answer D
Then
distance = speed x time
240 = 60 x t
time = 4
distance = speed x time
240 = 40 x t
time = 6
distance = speed x time
480 = s x 10
speed = 48
Which is answer D
