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The same tap fills this tank at a steady rate. The pictures show the tank at 8:00 a.m. and at 10:00 a.m. At what time will the tank be exactly full?

Class 7Tanks and Taps with FractionsFractions and Decimals

A12 noon
B10:30 a.m.
C1 p.m.
D11 a.m.

Step-by-Step Solution

From 8 to 10 a.m. (2 h) the level rose from

\frac{1}{4}

to

\frac{3}{4} : \frac{1}{2}

of the tank, i.e.

\frac{1}{4}

per hour.

\frac{1}{4}

is left, so it needs 1 more hour: 11 a.m.

Answer: D) 11 a.m.

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