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The length of a rectangle is thrice its breadth. If the perimeter of the rectangle is 120 cm, what is the breadth of the rectangle?

A.

16 m

B.

15 m

C.

12 m

D.

11 m

Answer with explanation

Answer: Option BExplanation

Let length of rectangle=lcm

breadth of rectangle= bcm

Given length is 3 times its breadth

i.e. l= 3×b

Perimeter of the rectangle= 120 cm

i.e.2×( l+ b)=120

2×(3×b+ b)=120

2×(4×b)=120

8×b=120

b= 15 cm

Workspace

A.

450 m

B.

470 m

C.

423.5 m

D.

495 m

Answer with explanation

Answer: Option BExplanation

Workspace

A man on the top of a vertical observation tower observes a car moving at a uniform speed coming directly towards it. If it takes 12 minutes for the angle of depression to change from 30° to 45°, how soon after this will the car reach the observation tower ?

A.

14 min. 35 sec.

B.

16 min. 23 sec.

C.

15 min. 49 sec.

D.

18 min. 5 sec.

Answer with explanation

Answer: Option BExplanation

Workspace

A boy is standing at the top of the tower and another boy is at the ground at some distance from the foot of the tower, then the angle of elevation and depression between the boys when both look at a each other will be

A.

Equal

B.

Angle of elevation will be greater

C.

Angle of depression will be greater

D.

Cannot be predicted for relation

Answer with explanation

Answer: Option AExplanation

Workspace

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