Answer:
Width of canal \[=5.4\text{ }m\] Depth of canal \[=1.8\text{ }m\] Length of water in canal for 1 hr. \[=25\text{ }km\]\[=25000\text{ }m\] Volume of water flown out from canal in 1 hr. \[=l\times b\times h\] \[=5.4\times 1.8\times 25000\] \[=243000\,\,{{m}^{3}}\] Volume of water for 40 min \[=243000\times \frac{40}{60}=162000\,\,{{m}^{3}}\] Area to be irrigated with 10 cm standing water in field \[=\frac{Volume}{Height}=\frac{162000\times 100}{10}{{m}^{2}}\] \[=1620000\,\,{{m}^{2}}\] \[=162\,\,\]hectare
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