Question

A particle moving in a straight line travels half time period with speed X m/s and the other half time period in two equal distances with speed 10 m/s and 20 m/s respectively. The average speed of particle during this motion is 30 m/s then the value of X is ?​
a. 120/3 m/s
b. 150/3 m/s
c. 140/3 m/s
d. 180/3 m/s​

Answer 1

Answer:

I think option B is correct

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Answer 2

Answer:

10+20m/s/2=15m/s

15m/s+xm/s/2=30m/s

15m/s+x=60m/s

x=45m/s