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Let the revolutins made by bigger wheel is: x
then revolution by smaller wheel will be: x+10
Now, the distance covered by both wheels will be same.
So,
7(x+10)=9x
7x+70=9x
70=2x
35=x
so distance travelled=9*35=315
or 7*45=315
Let the revolutins made by rear wheel be: x
then revolution by front wheel will be: x+10
Now, the distance covered by both will be same.
So,
7(x+10)=9x
7x+70=9x
70=2x
35=x
So the total distance is 7*35 i.e. 315 feets.