the area of a square field is 625 m square A boy moves along its boundary at 18 km per hour in how much time will he return to the starting point .find the square root.
the answer is 3 minute 16 second
Answers
Answer:
the answer i got is 20 seconds. Please check my calculation and inform if wrong.
Step-by-step explanation:
Step 1) Area = 625 m² (formula = s² / side × side)
⇒s² = 625 m²
∴s= √625m²
= 25 m
Step 2) ∴ the distance the boy will walk = Perimeter
= 4s ( or 4 × side)
= 4 × 25m
= 100 m
= 100 / 1000 km
= 0.1 km
Step 3) time= distance / speed
⇒ 0.1 km÷ 18 km/h
= 0.0056 hours
= 0.33 mins
= 20 seconds