It was war time

A cannon and a target are 5.10 km 5.10\text{ km} apart and located at the same level. How soon will the shell launched with initial velocity 240 m/s 240 \text{ m/s} reach the target in the absence of air drag?

P.S. : The answer has two values, depending upon the angle, one answer is 24.6 seconds. Find the other one.

15 seconds 12.5 seconds 42.6 seconds 28.7 seconds

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