Must Reach the Station in Time: Solution

Lucky for us, smart girl Rohini was around to advise us. We followed her advice and caught the train just in time. This is what she suggested:

Anil and Bhushan first go to the station, taking two minutes. Anil returns with the umbrella taking one minute. Chander and Deepak go to the station, taking ten minutes. Bhushan returns with the umbrella taking two minutes. Anil and Bhushan hurry back to the station, taking two minutes ... Just in time to catch the train!"