Question

The length and breadth of a playground are 75 m 20 cm and 34 m 80 cm, respectively. Find the cost of leveling it at 1.50 rupee per square metre. How long will a boy take to go three times round the field,if he walks at the rate of 1.5 m/sec,​

Answer 1

Answer: Rs. 3925.44 and 146.66666666s

Step-by-step explanation:

75m 20cm = 75.2 m

34m 80cm = 34.8m

Area of rectangle = lb

= 75.2m x 34.8m

= 2916.96$m^{2}$

Cost of levelling = rs. 1.5 x 2916.96

= rs. 3925.44

Perimeter of rectangle = 2(l+b)

= 2(75.2m + 34.8m)

= 2 x 110m = 220m

Time = Distance/Speed

= 220s/1.5

=  146.666666 s

Answer 2

Answer:

length - 7520 cm

breadth - 3480 cm

area = l x b = 7520 x 3480 = 26169600 cm² or 2616.9 m²

leveling 1 m² = rs 1.5

2616.9 m² = 2616.9 x 1.5 = Rs 3925.35

If he run 3 times around yhe field , then distance travelled by him will be

75.2 x 3 + 34.8 x 3 = 330 m

speed of boy - 1.5m/sec

speed = distance/ time

time taken = 220 sec