A plane maintains an average speed of 285mph from London to New York. It then returns from New York to London at an average speed of 76mph. What is the average speed for the entire journey?
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suresh
A plane maintains an average speed of 285mph from London to New York. It then returns from New York to London at an average speed of 76mph. What is the average speed for the entire journey?
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suresh
120 is the answer?
Regards,
Brijesh Jain
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Yes jainbrijesh.....Plz leave your solution...
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suresh
let distance=d,
av.speed1=v1=285
time=t1,
d=285*t1
here again distance=d
av. speed2=v2=76
time=t2
d=76*t2
now: 285*t1=76*t2
t2=(285/76)*t1
Now av. speed=2d/(t1+t2)
solve it and get the answer 120.
Last edited by jainbrijesh; 01-04-2007 at 01:49 AM.
Regards,
Brijesh Jain
---------------------------------------------------------
Connect with me on Skype: jainbrijesh
Google Plus : jainbrijeshji
Very Good Explanation buddy.....
Keep it up.....
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suresh