A rectangular lawn is 80 metres long and 60 metres wide. The time taken by a man to walk along its diagonal at the speed of 18 km. per hour is
Correct Answer: Description for Correct answer:
\( \Large d = \sqrt{ \left(80\right)^{2}+ \left(60\right)^{2} } = \sqrt{10000} =\ 100\ m \)
Therefore, \( \Large v = 18 km/hr = 18 \times \frac{5}{18}m/s =\ 5\ sec. \)
Therefore, \( \Large t = \frac{d}{v} = \frac{100}{5} =\ 20\ sec. \)
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