GRE Exam Numerical Ability Time Distance and Speed

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.

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GRE Other Question
In a basket full of balls, 60% are banana and remaining 40% are apple. 80% of apples are green and the rest 20% are yellow. Of the bananas, 80% are yellow and the rest of the bananas are green, What percentage of the green fruits are bananas? 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