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2 years ago

15

In a swimming race, Miho swam the first 50 m in 42 s. She swam the second 50 m in 38 s. What was Miho’s average speed during the

race?

1 answer:

Nat2105 [25]2 years ago

7 0

The answer is d) 0.82 m/s

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Susie has planned a trip to a city 60 miles away. She wishes to have an average speed of 60 miles/hour for the trip. Due to a tr

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Answer:

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Step-by-step explanation:

Given,

For first 30 miles, her speed is 30 miles per hour,

Let x be her speed in miles per hour for another 30 miles,

Since, here the distance are equal in each interval,

So, the average speed of the entire journey

$=\frac{\text{Average speed for first 30 miles + Average speed for another 30 miles}}{2}$

$=\frac{30+x}{2}$

According to the question,

$\frac{30+x}{2}=60$

$30+x=120$

$\implies x = 90$

Hence, she needs to go 90 miles per hour for remaining 30 miles.

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