Elijah, an astrophysicist, was observing the celestial bodies in the night sky. He made three observations and noted down the time of the observations. His observations were made at 7:00pm, 9:30pm and 11:20pm. He needs to know by what angle the Earth had rotated by the time he made his 2nd and 3rd observations relative to his 1st observation. Can you help him out?

37.5 degrees and 27.5 degrees

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27.5 degrees and 37.5 degrees

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37.5 degrees and 65 degrees

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27.5 degrees and 65 degrees

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Solution

The correct option is C 37.5 degrees and 65 degrees
The Earth rotates by 360 degrees in 24 hours or by 1 degree in 4 minutes. Therefore by the time Elijah made his 2nd observation, the Earth had rotated by 150/4= 37.5 degrees and his 3rd observation, the Earth had rotated by 260/4= 65 degrees.

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The correct option is C 37.5 degrees and 65 degreesThe Earth rotates by 360 degrees in 24 hours or by 1 degree in 4 minutes. Therefore by the time Elijah made his 2nd observation, the Earth had rotated by 150/4= 37.5 degrees and his 3rd observation, the Earth had rotated by 260/4= 65 degrees.

The correct option is C 37.5 degrees and 65 degrees
The Earth rotates by 360 degrees in 24 hours or by 1 degree in 4 minutes. Therefore by the time Elijah made his 2nd observation, the Earth had rotated by 150/4= 37.5 degrees and his 3rd observation, the Earth had rotated by 260/4= 65 degrees.