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Answered

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A TANK OF WATER IS EMPTIED IN 20 MINUTES IF THREE OUTLET VALVES ARE FULLY OPENED. HOW LONG WILL IT TAKE TO EMPTY THE SAME TANK IF FIVE OUTLET VALVES ARE FULLY OPENED?

Sagot :

60 minutes will take to empty all outlet valves.
1 hour............20 x three=60   then 60 minits is one hour