Maths

Due to the passing of the Personal Data Protection Bill, access to various Legal Websites like dailykanoon, and with legal india has been restricted. These websites provide information and updates about new laws and amendments. Ankur Luthra, (from United Kingdom) who runs these websites which provide legal resources to clients in India from overseas in the U.K. has been adversely affected. He is looking for a recourse to his problem. Based on the information and principles given in the passage above:
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There are four friends Rachel, Ross, Monica and Chandler who want to cross a bridge on the river at night. But they have only one torch with them. Only two people can cross the bridge at a time and everyone requires a different time to cross the bridge. The battery life of torch is only 15 minutes and the time required by the friends: Rachels needs 1 minute, Ross needs 2 minutes, while Monica requires 5 minutes and Chandler requires 8 minutes. How can they all cross the bridge before the torch dies off?

5$$ x = {-b \pm \sqrt{b^2-4ac} \over 2a}. $$
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