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Veronika [31]
3 years ago
11

I am having major trouble calculating the average speed for things. An example of a question would be, Rachel travelled 240 km i

n 4 hours by train and then travelled 120 km in 3 hours by car and 3 km in 1/2 hour by cycle. What is the average speed during the whole journey? I have a test over this tomorrow and my teachers doesn't explain anything very well.
Physics
1 answer:
expeople1 [14]3 years ago
3 0

The average speed is      (distance covered) / (time to cover the distance) .

<u>For example:</u>

The average speed for the 'car' part of her trip is

                  (distance covered in the car) / (time in the car) =

                                             (120 km) / (3 hours) = 40 km per hr.

<u>Answering the question:</u>

Average speed for the whole journey is

  (distance covered on the journey) / (time spent on the whole journey) =

                      (240 + 120 + 3) km /  (4 + 3 + 1/2) hours  = 

                                      363 km  /  7.5 hours  =  <em>48.4 km per hour </em>

Good luck on the test !


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