A man walking at the rate of 5 km/hr crosses a bridge in 15 minutes. The length of the bridge (in metres) is Choose the correct choice from the following answers.
A) 600
B) 750
C) 1000
D) 1250
E) none of these

Rationale: "explanation : speed = ( 5 × 5 / 18 ) m / sec = 25 / 18 m / sec . distance covered in 15 minutes = ( 25 / 18 × 15 × 60 ) m = 1250 m . answer : d"
Answer: D