In the other way, two automobiles pass each other. How long would it take them to go 500 kilometres apart? I. Their combined speed is 135 kilometres per hour. II. Their speed differential is 25 km/hr.
A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
Answer:A
In the other way, two automobiles pass each other. How long would it take them to go 500 kilometres apart? I. Their combined speed is 135 kilometres per hour. II. Their speed differential is 25 km/hr.
A. I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are not sufficient to answer
Explanation: I calculates a relative speed of 135 kilometres per hour.500 /135hours were spent on this project.The relative speed is not shown in II.I am the only one who knows the solution, and II is immaterial.