please can you answer the question attached in the photo below thank you

Find these two times, to the nearest hour and minute, if 1 unit of chemical is put into the chamber at the beginning of the process? Show your method clearly. . 7. The cartesian sketch below (which is not to scale) models an electric cable of length 60 V metres hanging between two pylons that are 45 metres high and are both on level ground. If the centre of the cable is 25m above the ground, what is the distance between the centres of the base of each pylon? Show your method clearly. You will need to use the following formulae but alter the y = acosh ( ) one to allow for the translation of the cable vertically downwards by the value of a so it coincides with a cartesian grid in which the lowest point of the cable is positioned at (0,0). Only use the positive half of the diagram when solving this problem and then double your answer for x to obtain the required distance. y = acosh (* and half the length of the cable = asinh (x) You will also need to use the identity: cosh - ) - sinh ) = 1 . . . .. .. . .... 3. . . .. .. -. ... .. ... . . . . . ... .. ..... ... . . ... . . . . . . .. . . . . . .