2. A massless string of length L passes over a frictionless pulley whose axis is horizontal. Two monkeys hang from the ends of the string at the same distance L/2 from the pulley, the monkeys start climbing upward simultaneously. First monkey climbs with a speed v relative to the string and the second with a speed 2v. Both monkeys have equal masses. Then the time taken by the first and second monkey is meeting each other are respectively