Two ants started to crawl towards each other at the same time
from two different spots. one ant crawled at a speed of 23
cm/min and another ant crawled at a speed of 19 cm/min. if
they met each other after 3 minutes, what was the distance
between the two spois?
cm

126cm

Explanation:

23+19=42

42 is the speed that they are both approaching each other.

42* 3 minutes = 126

So, after 3 minutes they will be 126 cm closer to each other.

The angular displacement of the gear in 2.50s is 492 rad.

Explanation:  

Given the speed of the gear = 1880 rev/min.

Angular displacement =?

So to calculate gear's angular displacement in 2.5 seconds,  

we have to convert rev/min to radians/sec.  

Conversion of 1880 rev/min to radians/sec:  

This is

So the gear will travel 196.9 radians in 1 second.  

Now, multiply this by 2.5, and we get 492.2 radians.