How long will a boy take to run round a square field of side 35 metres. If he runs at the rate of 9km/hr ?	Choose the correct choice from the following options:
A) 56 sec  B) 1minute  C) 45sec  D) 58sec  E) 50sec
Speed = 9 km/hr = 9*5/18 = 5/2 m/sec   distance = 35*4= 
<gadget id="calculator">35*4</gadget>
<output>140</output>
140 m   time taken= 140*2/5= 
<gadget id="calculator">140*2/5</gadget>
<output>56</output>
56 sec.   56 secnswer is 56 sec
<result>A</result>
How long will a boy take to run round a square field of side 35 metres. If he runs at the rate of 9km/hr ?