Duplain st. is 300m long and runs from west to east between baron and burkey. if keith is strolling east from baron at an average velocity of 3km/hr, and sue is power-walking west from burkey at an average velocity of 6km/hr, how long will it take them to meet?
a. 1 minute
b. 2 minutes
c. 3 minutes
d. 6 minutes

Time, t = 2 minutes

Explanation:

Given that,

Length of Duplain st. d = 300 m = 0.3 km

If keith is strolling east from Baron at an average velocity of, v = 3 km/hr

Sue is power-walking west from Burkey at an average velocity of, v' =  6 km/hr

To find,

How long will it take them to meet ?

Solution,

When both objects are travelling in opposite direction, then the total speed is given by :

V = v + v'

V = 3 km/hr + 6 km/hr

V = 9 km/hr

Let t is the time taken will it take them to meet. It can be calculated as :

t = 0.033 hour

or

t = 1.98 minutes

i.e. t = 2 minutes

So, they will take 2 minutes to meet. Hence, this is the required solution.

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we need to know the time interval during which the force acts. impulse of force = momentum change