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Use trigonometry to find the distance of each boat from the cliff's base and subtracting both distances gives a distance of 40.5 meters between them to 1 d.p.
No. The sine of an acute angle is less than 1. An acute angle is less than 90 degrees. The sine of 0 degrees is 0, and the sine of 90 degrees is +1. So the sines of the angles between 0 degrees and 90 degrees are less than 1.
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The minute hand will be 4/12 = 1/3 of 360 degrees clockwise from up, so 120 degrees. The hour hand will be 10/36 = 100 degrees clockwise from up. 120 - 100 = 20 degrees.
1 degree because 179+1 = 180 degrees