It takes one minute to fill 4/5 of a tank. How much time is needed to fill an empty tank?

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Solution

Time taken to fill 4/5 of tank = 1 minute
Time taken to fill an empty tank = x

From above
4x / 5 = 1
x = 5/4
x = 1.25 minutes
x = 1 minute + 0.25 minutes
x = 1 minute + 0.25×60 seconds
x = 1 minute 15 seconds

Time taken to fill an empty tank is 1 minute 15 seconds

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It takes one minute to fill 4/5 of a tank. How much time is needed to fill an empty tank?

Time taken to fill 4/5 of tank = 1 minute Time taken to fill an empty tank = x From above 4x / 5 = 1 x = 5/4 x = 1.25 minutes x = 1 minute + 0.25 minutes x = 1 minute + 0.25×60 seconds x = 1 minute 15 seconds Time taken to fill an empty tank is 1 minute 15 seconds

Time taken to fill 4/5 of tank = 1 minute
Time taken to fill an empty tank = x

From above
4x / 5 = 1
x = 5/4
x = 1.25 minutes
x = 1 minute + 0.25 minutes
x = 1 minute + 0.25×60 seconds
x = 1 minute 15 seconds

Time taken to fill an empty tank is 1 minute 15 seconds