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22 Jun 2016, 03:06
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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:
45%
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Question Stats:
70% (02:36) correct
30%
(02:47)
wrong
based on 301
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Two cars are driving towards one another. The first car is traveling at a speed of 120 Km/h, which is 28% faster than the second car. If the distance between the cars is 855 Km, how long will it takes the cars to meet (in hours)?
A. 2.5.
B. 3.
C. 3.5.
D. 4.
E. 4.5.
A. 2.5.
B. 3.
C. 3.5.
D. 4.
E. 4.5.
22 Jun 2016, 03:32
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When ever two bodies/ objects move towards each other (i.e. opposite directions ) we have to add their respective rates/speeds.
This concept is similar to the concept of workdone in that the two bodies are working together to reduce the distance between them (i.e. the work that needs to be done).
Back to the question:
Let S be the speed of the slower car.
Then the speed of the faster is 1.28S
1.28S = 120
S = 120/1.28
Cumaltive speed/rate = S + 1.28S = 2.28S
Time taken to meet = 855/2.28S =855/213.75 = 4hrs
D IS THE CORRECT ANSWER.
This concept is similar to the concept of workdone in that the two bodies are working together to reduce the distance between them (i.e. the work that needs to be done).
Back to the question:
Let S be the speed of the slower car.
Then the speed of the faster is 1.28S
1.28S = 120
S = 120/1.28
Cumaltive speed/rate = S + 1.28S = 2.28S
Time taken to meet = 855/2.28S =855/213.75 = 4hrs
D IS THE CORRECT ANSWER.
