Question

The length and breadth of a playground are 80m and 35m respectively.
i) Find the cost of levelling it at Rs. 4.50 per square metre.
ii) How long will a boy take to go three times round the field, if he walks at rate of 1.5 m per second?​

Answer 1

Answer:

It actually isn't mine but from a website, I study from hope it helps you!

Answer 2

Answer:

The answers are:

i)Rs 12600

ii) 460s

Step-by-step explanation:

l=80, b=35

i) Area of the playground= l×b

=80×35

=2800 sq m

Cost of levelling 1 sq m =Rs 4.5

So, the cost of levelling 2800 sq m of the playground = Rs (4.5×2800)

= Rs 12600

ii) perimeter of the playground=2×(l+b)

=2×(80+35)

=230m

Speed=1.5m/s

Speed=distance/time

So, time= distance / speed

=230/1.5

=153.3s per round

So time taken for 3 rounds=3× 153.333

=460s