A man generates a symmetrical pulse in a string by moving his hand up and down. At t = 0, the point on his hand moves downward. The pulse travels with speed of 3 m/s on the string & his hands passes 6 times in each second from the mean position. Then at what time the point on the string at a distance 3 m from the hand will reach its upper extreme first time?
A. 1. 25 sec
B. 1 sec 13
C. sec 12
D. 1. 4 sec