Being 250 meters apart, two puppies started running towards each other at the same time. the first puppy ran 1.5 meter per second, while the second one ran 2.5 meters per second. what was the distance between them in half a minute?

130 meters

Step-by-step explanation:

Puppy 1

d=rt

We know the rate = 1.5 m/s  and the time = 1/2 minute = 30 seconds

d = 1.5 * 30 = 45 meters

Puppy 2

d=rt

We know the rate = 2.5 m/s  and the time = 1/2 minute = 30 seconds

d = 2.5 * 30 = 75 meters

The puppies ran a total of 75+45 = 120 meters

The total distance was 250

250-120 = 130

There was still a gap of 130 meters between the puppies.

step-by-step explanation:

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a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.