A plane flew 125 mph for 30 minutes. It sped up and flew 145 mph for the rest of the hour. How far did the plane fly?

Answer 1

One hour total flight and 135 miles.

The flight is 1 hour and the first half speed of the plane was 125 miles per hour. In the second half, plane speed was 145 miles per hour.

Now you can put this equation

#Length = 0.50times125 + 0.50times145 = 135# miles

The average speed of the plane was 135 miles per hour. And since the duration was 1 hour, the plane took 135 miles (as a straigth way).

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Answer 2

See a solution process below:

The formula for distance traveled is:

#d = r xx t#

Where:

#d# is the distance traveled: what we are solving for in this problem,
#r# is the rate of travel or speed. In this problem we have two rates:
#(125"mi")/"hr"#
#(145"mi")/"hr"#
#t# is the time traveled. In this problem we also have two times both of them the same.
We can now write and substitute and then calculate #d# as:
#d = ((125"mi")/"hr" xx 0.5"hr") + ((145"mi")/"hr" xx 0.5"hr")#
#d = ((125"mi")/color(red)(cancel(color(black)("hr"))) xx 0.5color(red)(cancel(color(black)("hr")))) + ((145"mi")/color(red)(cancel(color(black)("hr"))) xx 0.5color(red)(cancel(color(black)("hr"))))#
#d = 62.5"mi" + 72.5"mi"#
#d = 135"mi"#
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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