a, b, k start from the same place and travel in the same direction at speeds of 30 km / hr, 40 km / hr, 60 km / hr respectively. b starts 6 hours after a. if b and k overtake a at the same instant, how many hours after a did k start?
Choose the correct choice from the following options
A) 3	B) 4.5	C) 4	D) 12	E) 5
<gadget id="calculator">30 * 6</gadget>
<output>180</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">180 / 10</gadget>
<output>18</output>

<gadget id="calculator">6 + 18</gadget>
<output>24</output>

<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<gadget id="calculator">720 / 60</gadget>
<output>12</output>

<result>D</result>
a, b, k start from the same place and travel in the same direction at speeds of 30 km / hr, 40 km / hr, 60 km / hr respectively. b starts 6 hours after a. if b and k overtake a at the same instant, how many hours after a did k start?
divide(multiply(30, add(6, divide(multiply(30, 6), subtract(40, 30)))), 60)
the table you made does n ' t make sense to me . all three meet at the same point means the distance they cover is the same . we know their rates are 30 , 40 and 60 . say the time taken by b is t hrs . then a takes 6 + t hrs . and we need to find the time taken by k . distance covered by a = distance covered by b 30 * ( 6 + t ) = 40 * t t = 18 hrs distance covered by b = distance covered by k 40 * t = 60 * time taken by k time taken by k = 40 * 18 / 60 = 12 hrs time taken by a = 6 + t = 6 + 18 = 24 hrs time taken by k = 12 hrs so k starts 24 - 12 = 12 hrs after a . ( answer d )