18. The velocity of three particles A, B, C are given below. Which particle travels at the greatest speed? VA =3 – 5 ġ + 2 , VB = î + 29 + 3k , VB = î + 2ſ + 3Â , vc = 5î + 3ġ + 4k
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Explanation:
1 degree equals 4 minutes.
According to the question, the time at 90 degree East longitude is 11 am, and to reach 15 degree west longitude it will have to go 105 degrees east as first of all it will go to 0 degree and then 15 degree to reach 15 degree west longitude.
1 degree = 4 minutes
105 degree = 105×4= 420 minutes
420÷60= 7 hours
We know that by moving from East to West, time decreases. So, we will have to subtract 7 hour from 11am to know the time at that place.
Therefore, 11am - 7hr= 4 am
So, the time will be 4am at 15 degree west longitude if the time is 11am at 90 degree East longitude
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