How long will a boy take to run round a square field of side 45 meters, if he runs at the rate of 9km/hr?	Choose one: A) 72sec B) 45sec C) 1min D) 32sec E) 25sec
Speed = 9 km/hr = 9*5/18 = 5/2 m/sec   Distance = 45*4= 
<gadget id="calculator">45*4</gadget>
<output>180</output>
180m   Time taken= 180*2/5= 
<gadget id="calculator">180*2/5</gadget>
<output>72</output>
72sec   72secnswer is 72sec
<result>A</result>
How long will a boy take to run round a square field of side 45 meters, if he runs at the rate of 9km/hr?