Two boats of length 17.5 metres and 22.5 metres are separated by a distance of 800 metres and started moving towards each other. If the boats can cross each other’s distance in 4 sec, then find the time after they cross each other to reach 1800 metres apart.
1
2 minutes
2
2.5 minutes
3
4 minutes
4
3.5 minutes
5
3 minutes