Three separate strings are made of the same material. String 1 has length L and tension T,

Question:

Three separate strings are made of the same material. String 1 has length L and tension T, string 2 has length 2L and tension 2T, and string 3 has length 3L and tension 3T. A pulse is started at one end of each string. If the pulses start at the same time, the order in which they reach the other end is: