Question

The area of a square plot is 4900m.if a man walks around it at the speed of 4km per hour,then how much time will he take to go round it once?

Answer 1

it will take 1hour 42 Mins to go round it once

Answer 2

Answer:

find: how much time will he take to go round it once?

4 mins 12 seconds

Solution:-

area of given square plot = 4900m²

side of the square plot

$= \sqrt{area} = \sqrt{4900 {m}^{2} } \: = \: 70m$

Perimeter of the square = 4 × side = (4×70)m = 280m

Distance walked by the man =280m

speed of walking = 4 km/hour

$= 4 \times \frac{5}{18} \: m/s = \frac{10}{9} m/s$

$time \: taken \: = \: \frac{distance}{speed} = \: \frac{ \frac{280 \: m}{10} }{9} ms \\ \\ = \frac{280 \times 9}{10} = \: 252seconds \: = \frac{252}{60} minutes \\ \\ = 4minutes \: 12 \: seconds$

✅ Hence, the men will take 4 minutes 12 seconds to go around the square plot once.