Question

11) The area of a rectangular field is 60 m2 and one of its sides is 5m. How
long will it take to cross the field diagonally at the rate of 12 m/minute?​

Answer 1

Step-by-step explanation:

area=l×b

lb=60cm²

5x=60cm²

x=12cm

diagonal=√12²+5²

=√144+25

=13m

12m/min=1/5m/s

13/1/5=60 seconds or 1min

Answer 2

Answer:

Answer is 30 sec

Step-by-step explanation:

Given, the area of a rectangular field is 48m

2

and one side of the rectangle is = 6m.

Therefore, area of a rectangle = length×breadth

⇒ 48 = 6×breadth

⇒ Breadth = 8 m

In triangle ACD, ∠D=90

∘

Use pythagoras theorem

⇒ (AC)

2

=(AD)

2

+(DC)

2

⇒ (AC)

2

=(6)

2

+(8)

2

⇒ (AC)

2

= 36+64

⇒ (AC)= \sqrt{100} $$ = 10 m

Time taken at the rate of 20 m/ min = distance/ speed

= 10/20 = 30 sec