4 Persons Problem

Well...

• There are 4 persons in one side of the river.
• There is only one boat available.
• They need to use the boat to cross the river.
• The boat can take a max of 2 people.
• When 2 people are in the boat, both need to row.
• Based on the rowing style, the speed with which a person can make the boat cross the river is 1Min, 2M, 5M & 10M.
• When 2 people go in the boat, the slowest person overtakes the other.
• So, what is the least time by which all four can cross the river?