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This topic has 3 member replies
d77 Newbie | Next Rank: 10 Posts Default Avatar
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Post Thu Dec 14, 2006 11:09 am
Circular gears P and Q start roating at the same time at constant speeds.gear P makes 10 revolutions per minute and gear Q makes 40 revolutions per minute.
How many seconds after the gears start roating will gear Q have made exactly 6 more revolutions then gear p?

6
8
10
12
15

Quote:
12

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aim-wsc Legendary Member
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Post Mon Dec 18, 2006 10:27 am
May be a lil exp to answer:

Gear P has 10 revolution per min
& G Q has 40

that means ever one revolution of P, Q revolves around four times.

after 2 revolution of P, Q would have revolved around itself 8 times.
in other words would have made 6 more rotations.

P takes 1/10 mins for one revolution. therefore 12 secs for 2 revolution.
Answer 12

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800guy Master | Next Rank: 500 Posts Default Avatar
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Post Sat Dec 16, 2006 9:04 pm
thanks, thankont!

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thankont Senior | Next Rank: 100 Posts
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Post Fri Dec 15, 2006 2:03 pm
One approach could be this :
first case 1/6 rev. per sec
second case 2/3 rev. per sec
if we substitute 12 sec we get 2 rev for first case and 8 rev for second
so difference is 6

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