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 seven hours after a . if b and k overtake a at the same instant , how many hours after a did k start ?
"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 7 + t hrs . and we need to find the time taken by k . distance covered by a = distance covered by b 30 * ( 7 + t ) = 40 * t t = 21 hrs distance covered by b = distance covered by k 40 * t = 60 * time taken by k time taken by k = 40 * 21 / 60 = 14 hrs time taken by a = 7 + t = 7 + 21 = 28 hrs time taken by k = 14 hrs so k starts 28 - 14 = 14 hrs after a . ( answer e )"
subtract(40, 30)