10 students went boating. They rented a boat that can only take six people, so that only six people can row at a time, and the rest will play on the shore, and then everyone will take turns. If the boat is rented for two hours, everyone will row for the same time. How many hours did everyone play on the shore?

Answer:

One: Six people on board, two hours later, add up to 6*2= 12 hours.

Everyone rowed at the same time, so everyone rowed 12/ 10= 1.2 hours.

Everyone played on the shore for 2- 1.2=0.8 hours.

(Calculate rowing time)

Two: 10 people played for 2 hours, that is, the total play volume was 20.

The total number of boats that can only be played in 2 hours is 12.

So the total time for everyone to play on the shore is 8.

That is, everyone plays on the shore for 0.8 hours.

(It's too late)

A: Everyone played on the shore for 0.8 hours.