Answer:
just a example
Explanation:
Elena always rides her bicycle at a speed of 15 miles per hour. On Sunday, she goes on a 24 mile bike ride. How many hours does this ride take?
Solution
The speed of 15 miles per hour is a rate. The key words that tell us that this is a rate are "speed" and "miles per hour". We can write:
r = 15
Next, 24 miles is a distance. We have:
d = 24
Now use the d=rt equation to get
24 = 15t
To solve this, divide both sides by 15 to get
t = 24/15
Both are divisible by 3, so this fraction reduces to
t = 8/5 = 1.6
Elena's ride takes 1.6 hours.
Answer:b
Explanation:
took test, might be wrong
Answer:
The distance between the submarine is, d = 9933.3 m
Explanation:
Given data,
The speed of the submarine A and B, v = 5 m/s
Submarine A produces a pulse of sound to detect B at a distance, d = 10 km
= 10000 m
The speed of sound in water is, V = 1500 m/s
The time period to receive echo is given by the formula,
t = d / v
= 10000 / 1500
= 6.67 s
The distance between the submarine is given by the relation
d = 10000 - 2(v x t)
= 10000 - 2(5 x 6.67)
= 9933.3 m
Hence, the distance between the submarine is, d = 9933.3 m
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The object particle move faster.