Four boys, Ariel, Russel, Haider and Sameer need to cross a bridge. It was dark and they only have one torch which they need to use to cross the bridge. Each of them have crossed the bridge before alone.
Ariel can run and cross it for one minute.
Russel can also do it in two minutes.
Haider needs five minutes to cross the bridge.
Sameer needs ten minutes.
The bridge is narrow and weak so it can only carry two people at a time.
What is the minimum number of minutes it would take all the four people to cross the bridge?
Posted Status in Education