Local trains leave from a station at an interval of 15 minutes at a speed of 16 km/h. A man moving from opposite side meets the trains at an interval of 12 minutes. Find the speed of the man. Choose the correct choice from the following answers.
A) 4 km/h B) 3.5 km/h C) 4.5 km/h D) 3 km/h E) None of these
Let speed of man = S km/h. Then,   Distance covered in 15 min = Distance covered in 12 min   16 × 15⁄60 = 12⁄60[16 + S]   ⇒ 16 + S = 20 ⇒ S = 4 km/h   4 km/hnswer 4 km/h
<result>A</result>
Local trains leave from a station at an interval of 15 minutes at a speed of 16 km/h. A man moving from opposite side meets the trains at an interval of 12 minutes. Find the speed of the man.