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    neilanthonyv's Avatar
    neilanthonyv Posts: 2, Reputation: 1
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    #1

    Sep 2, 2013, 03:17 AM
    How to find the average speed?
    Q: A car travels for 10 minutes at 30km/h and then for 20 minutes at 45 km/h. The average speed for the whole journey is...
    A. 40 km/ h
    B. 37 1/2 km/h
    C. 20 km/ h
    D. 35km/h

    Thanks.
    anime36501's Avatar
    anime36501 Posts: 5, Reputation: 1
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    #2

    Sep 2, 2013, 05:36 AM
    I believe it's 37and a half.
    neilanthonyv's Avatar
    neilanthonyv Posts: 2, Reputation: 1
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    #3

    Sep 2, 2013, 06:15 AM
    How could you say that? Can you give me a solution?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Sep 3, 2013, 06:01 AM
    The average velocity is found by calculating the total distance traveled and dividng by the total time of the trip. So step 1: calculate how far he travelled in the first phase when going at 30 KPH, using distance = rate times time. Step 2: calculate how far he travelled in the second phase when going 45 KPH. Step 3: add these two distances to get the total distance covered. Step 4: add the time taken in phase 1 to the time in phase 2 to get the total time. Step 5: divide the total distance by the total time to get the avarege velocity.

    Hint: the answer that anime36501 gave is incorrect.
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