Two people take a boat, and only one boat can carry one person at a time. How can they cross the river? There is a box of mosquito-repellent incense, and a roll of mosquito-repellent incense burns 3 m

Two people take a boat, and only one boat can carry one person at a time. How can they cross the river? There is a box of mosquito-repellent incense, and a roll of mosquito-repellent incense burns 3 minutes on average. How to measure 45 minutes?

1. You can cross the river once. Two people together, take turns to jump, so that the weight of the boat has been only one person.

2. Burn a roll of mosquito-repellent incense completely for 3 minutes; Light another roll of mosquito-repellent incense at both ends for 15 minutes. It can be measured for 45 minutes.

I hope it helps you.