John walking at 4 Kmph reaches his office 8 minutes late. If he walks at 6 Kmph, he reaches there 7 minutes earlier. How far is the office from his house?  Choose the correct choice from the following choices:
A) 3 Km
B) 3 1/5 Km
C) 4 1/5 Km
D) 5 1/5 Km
E) None
Formula = S1*S2/S2-S1 * T1+T2/60   = 4*6/2 * 15/6   = 24/2 * 15/60   = 15/5= 
<gadget id="calculator">15/5</gadget>
<output>3</output>
3 Km   3 Km
<result>A</result>
John walking at 4 Kmph reaches his office 8 minutes late. If he walks at 6 Kmph, he reaches there 7 minutes earlier. How far is the office from his house?