Question

the length and breadth of a playground are 80m and 35 respectively. 1 . find the cost of leveling it at rs. 4.50 per square metre . 2. how long will a boy take to go three times round the field if he walks at rate of 1.5 m per second
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Answer 1

Step-by-step explanation:

Length of playground 80m

breadth of playground 35m

Area of playground lengthx breadth

80×35= 2800msq

cost levelling= 4.50×2800

12600rs

Thus cost of levelling is 12600 rupees

perimeter of ground = 2 ( length +breadth)

2 (80+35)

=150 m is perimeter of ground

a boy run three times 150×3 = 450

time taken distance per second= 1.5m

450x 1.5= 675seconds

Thus he will complete in 675 seconds

Answer 2

# According to question

Length = 80m

Breath = 35m

Solution

given :-

(area of the playground = Length × breadth)

= 90 × 35

= 90 × 35= 3150m²

➪

(Now it's given that the cost of

levelling is 4.50 per8m².)

therefore total cost of

levelling=

4.50 × 3150= 14175 rupees.

➪second part..

➪ we have to find

out the time taken by the boy

if he goes around the

playground three times

( 1.5) second per meter.

first of all, we have to find it's

perimeter of the playground = 2 ( l + b )

= 2 ( 80 + 35 )= 2 × 115= 230m

☞︎︎︎ therefore total distance

travelled by the boy = 230 × 3

( since he goes around the

playground 3 times )= 690m

➪total time Taken = 690 × 1.5

total time Taken = 690 × 1.5= 1035 seconds

In minutes = 1035/60

( one minute = 60seconds )

( one minute = 60seconds )= 17.25 minutes

✵ Hence the Question Solved ♧︎︎︎