Question

Two twins are running away from their mother in opposite directions one with the speed of 10 feet per second and the other with the speed of 8 feet per second. How and with what speed does the distance between the twins change?

Answer 1

with speed of 18 feet per second the distance between the twins change.

Explanation:

Here we have , Two twins are running away from their mother in opposite directions one with the speed of 10 feet per second and the other with the speed of 8 feet per second. We need to find How and with what speed does the distance between the twins change. Let's find out:

Two twins are running in opposite directions , Let us suppose one twin speed is denoted by
`v_1` , i.e. 10 feet per second

⇒
`v_1=10`

Now , Speed of other twin is
`v_2` , i.e. -8 feet per second . Minus sign shows the direction as this twin is moving in opposite direction :

⇒
`v_2=-8`

Now, Difference in both speeds will give the change in speed between them :

⇒
`v_1-v_2=10-(-8)`

⇒
`v_1-v_2=18`

Therefore , with speed of 18 feet per second the distance between the twins change.