Question

A rectangular field is 72m by 58 m. Amar walks round it at the rate of 3 km per hour. What time will he take in taking 2 rounds
THE ANSWER IS 10 MIN 24 SEC
bit I need the explanation ​

Answer 1

Step-by-step explanation:

Amar walks around the rectangular field so we have to find the perimeter of the field first and then, to find the total distance travelled, multiply the perimeter by 2. Apply distance, speed and time formula to calculate time.

Given, rectangular field is 72 m by 58 m.

Therefore, perimeter of rectangular field = 2(l + b) = 2(72 + 58) m = 260 m.

Distance covered by Amar in 1 round is equal to the perimeter of the rectangle.

Now it is also given that Amar walks around the rectangular field so it covers 260 m in one round.

Therefore, the total distance covered by Amar in 2 rounds = 2 x 260 m = 520 m.

Also we have, Distance = Speed × Time

Speed of Amar = 3 km/h =3×10003600

m/s {1 km = 1000 m and 1 h = 3600 s}

                                             = 56m/s

Thus, we can say that Amar covers 56 meter in 1 second

Therefore, he covers 520 m in 56056 second = 560×65s = 424 s =42460minutes = 10.4 minutes {1 minute = 60 second)