Grandfather Clock Strikes Ten
Algebra
Level
3
Up in the attic, there is a grandfather clock which takes 7 seconds to strike 7 o'clock. How long will the same clock take to strike 10 o'clock?
Image credit: Wikipedia Grandfatherclocks
10
9
10.5
9.5
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1 solution
To strike 7 , the clock strikes its first gong at 7 and it strikes 6 more intervals ....thus for each interval time taken would be 7/6 seconds
therefore to strike 10, it needs to cover 9 intervals, which will take
9 * 7/6 = 10.5 seconds