Two cars approach each other on a straight and level road. car a is traveling at 75 km/h, due north and car b is traveling at 45 km/h due south. both velocities are measured relative to the ground. at a certain instant, the distance between the cars is 15 km. how long will it take, in seconds, from that instant for the two cars to meet?

it will take the cars t = 0.125 h for them to have a distance of 15 km between them.

Explanation:

at the instant the cars are 15 km apart they gonna have to move:

75×t and 45×t respectively

where t is the time it will take them to be move until they 15 km apart,then to find the time:

75×t + 45×t = 15

120×t = 15

t = 0.125 h

Therefore, it will take the cars 0.125 hours for them to end up being 15 km apart.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures