Rabin has 3 cows in his farm. If he he decide to arrange the cows in every possible combination and moved just one cow every 5 minute, how long would it taken by him ?	Choose the correct choice from the following:	A) 12 minutes	B) 15 minutes	C) 40 minutes	D) 10 minutes	E) 30 minutes
Explanation:   Clearly, number of ways of arranging 3 cows = 3 ! = 3 x 2 x 1 = 6.   So, total time taken = 6*5= 
<gadget id="calculator">6*5</gadget>
<output>30</output>
30 minutes   Answer: 30 minutes
<result>E</result>
Rabin has 3 cows in his farm. If he he decide to arrange the cows in every possible combination and moved just one cow every 5 minute, how long would it taken by him ?