If a man can cover 12 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Answer: B
12 m/s = 12 * 18/5 kmph
3 hours 45 minutes = 3 3/4 hours = 15/4 hours
Distance = speed * time = 12 * 18/5 * 15/4 km = 162 km.