jmoreno486
26.08.2020 •
Mathematics
A kite is 30m from the ground. A cyclist observes it flying when he looks up at an angle of 20°. After 15 seconds, the cyclist has to look up at an angle of 60° to see the kite. Calculate the speed of the cyclist. Give your answer in km/h.
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Ответ:
8x + 28 = 180
8x = 180 - 28
8x = 152
X = 152 : 8
X = 19