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A lake has a circumference of two kilometers. A and B both d

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A lake has a circumference of two kilometers. A and B both d

by Max@Math Revolution » Thu Aug 15, 2019 5:31 pm

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[GMAT math practice question]

A lake has a circumference of two kilometers. A and B both departed from the same point on the circumference at the same time and walked in opposite directions. They met 30 minutes after their departure. What is the sum of the speeds of A and B?

A. 3 km/hr
B. 4 km/hr
C. 5 km/hr
D. 6 km/hr
E. 7 km/hr
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by Max@Math Revolution » Sun Aug 18, 2019 5:14 pm
=>

Let a and b be the velocities of A and B, respectively.
Then (30/60)a + (30/60)b = (1/2)a + (1/2)b = 2.
Thus, a + b = 4.

Therefore, B is the answer.
Answer: B
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