A man walking at the rate of 6 km/hr crosses a bridge in 15 minutes. The length of the bridge is ______.  Choose the correct answer:  A) 1000 m  B) 1250 m  C) 1500 m  D) 1800 m  E) 2300 m

Rationale: "hint : to find the answer in meter , we will first convert distance from km / hour to meter / sec by multiplying it with 5 / 18 . also , change 15 minutes to seconds by multiplying it with 60 . distance = speed x time 1 . convert speed into m / sec : 6 x 5 / 18 m / s = 1.66 m / s 2 . convert time from minutes into seconds = 15 x 60 s = 900 sec 3 . calculate : distance = 1.66 x 900 = 1500 m answer is c"
Answer: C