Five pipes can fill a tank in 80minutes . How long it will take to fill the tank if 8 pipes are used? (Please solve according to direct and inverse variations)
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Answer:
it is an example of inverse variation
5 pipes fill a 1 tank in 80 min
5×1×80=400
the product of quantities is constant in inverse variation
therefore
in second condition
8×1×(x )min=400
therefore x=50min
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