1.It took Jack 4 hours to drive from his house to the beach at a speed of 45km/h. If he takes 5 hours to make the return trip home,what will his speed be?
4 * 45 = 180 km
180 / 5 = _____km/h
d = rate * time
45 * 4 = rate * 5
rate = 45 * 4 / 5 = 36 km/h
To find Jack's speed on the return trip, we need to first calculate the distance he covered during his trip to the beach.
We can use the formula: Distance = Speed x Time.
On the trip to the beach, Jack's speed was 45 km/h, and he took 4 hours. Therefore, the distance covered is:
Distance = 45 km/h x 4 hours = 180 km.
Now, let's find Jack's speed on the return trip. This time we know that he took 5 hours to make the return trip. We can use the formula again:
Speed = Distance / Time.
The distance traveled on the return trip is the same as before, which is 180 km. The time taken is 5 hours. So, we can calculate Jack's speed on the return trip:
Speed = 180 km / 5 hours = 36 km/h.
Therefore, Jack's speed on the return trip is 36 km/h.