GRE Exam Numerical Ability Time Distance and Speed

A and B start from a point and run in opposite directions along the circumference of a circular park. The circumference of the park is 4200 meters. The speeds of A and B are 500 m/min and 700 m/min respectively. Which of the following is true? Indicate all correct options.
A. They meet each other in 3.5 minutes
B. A covers 1750 meters when they meet
C. B covers 1750 meters when they meet
D. A covers 2450 meters when they
E. B covers 2450 meters when they meet

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GRE Other Question

If Adam walks at 5/4 of his usual speed, he shall reach his office 6 minutes earlier than he usually does. Which of the following statements is true? Indicate all correct options.
A. His office is 5 km away
B. Usually he takes 30 minutes to reach his office
C. He shall reach his office in 24 minutes if he walks at 5/4 of his usual speed.
D. Usually he takes 24 minutes to reach his office
E. He shall reach his office in 18 minutes if he walks at 5/4 of his usual speed. Let A = {-1, 0, 2, 3, 5, 6} and f(x) = x^2 -x -2. Find f(A). Indicate all correct options. [x^2 = x*x]
A. {-1, 0, 2, 3, 5, 6}
B. {f(-1), f(0), f(2), f(3), f(5), f(6)}
C. {-2, 4, 18, 28}
D. {0, -2, 4, 18, 28}
E. { 0, 1, 2, 6, 20}