A man walking at a rate of 10km/hr crosses a bridge in 15 minutes. The length of the bridge is?
Pick one:  A) 1521  B) 1492  C) 1667  D) 2500  E) 1112

Rationale: "speed = 10 * 5 / 18 = 50 / 18 m / sec distance covered in 15 minutes = 50 / 18 * 15 * 60 = 2500 m answer is d"
Answer: D