Question

A man walking at a speed of 4 km per hour crosses a square field diagonally in 3 minutes the area of the field is

Answer 1

Answer:

first take the 4 kilometre per hour and multiplied by 5 by 18 to get into metre per seconds next take out the time in seconds is equal to 180 seconds therefore you get the speed to be done by 10/9 metre per second.time =180 second. now by the formula of speed =to distance upon time you can calculate the distance= to 10 by 9 into 180 = 200 metres therefore the length of the diagonals equal to 200 metres from Pythagoras Theorem we can take out the length of the diagonals in the form of in with respect to the side BC is equal to root 2 A therefore 200 metre is equal to root 2 A . calculate the length of a diagonal root 2 into 100. I need the area of a square = 100 root 2 into 200 = 20000 metre square

Answer 2

Answer:

20 km2

Explanation:

area covered in 1h= 4 km

area covered in 1 min.=4/60 km=1/15km [ since 1h=60 min]

area covered in 3 min=1/15×3=1/5 km

since 1km=1000m

therefore,1/5km=1/5×1000=200m

now, since area covered is diagonally covered.

therefore diagonal of square=200m

since,area of square=(diagonal) sq./2

2

therefore , area =(200)/2

=200×200/2

=20000m sq.

=20 km sq .