I'm an Engineer

A, B, C & D are about to cross a flooded river at night. ‘A’ can cross the River in 1 minute, ‘B’ can cross in 2 minutes, ‘C’ can Cross in 5 minutes and ‘D’ can cross in 10 minutes by swimming (Definitely!). They have only one torch that can last (can provide light) for only 17 minutes. The main problem is, all of them cannot go together, only two person can cross at once. They must cross the river and they all did. How?

Give it a try, and I’ll post the answer in a few days time.