A man walking at a rate of 4 km/h crossed a tunnel in 18 minutes. What is the length of the tunnel in meters?
Answer & explanation
Correct answer: option 3
Speed = 4 km/h
4 km/h = 4 × \(\frac{5}{18}\) = \(\frac{10}{9}\) m/sec
Time = 18 minutes = 18 × 60 sec = 1080 sec
Distance = Speed × Time
= \(\frac{10}{9}\) × 1080
= 1200 m