A person covers half his journey by train at 60kmph the remainder half by bus at 30 kmph and the rest by cycle at 10 kmph.find his average speed during the entire journey

20kmph is the average speed travelled by the person.

Question no 50. Please provide me the solution of it .

let x , y be speed of 1 and 2 in downstream. y=x+8 and y=1.5*x ==> x=16 and y=24if v1 and v2 are the speeds in still water then v1+x=16 and v2+x=24given v2-x=2*(v1-x)solving these 3 eq we get 20

If the coordinates of the mid-point of the line segment joining the points (2, 1) and (1, – 3) is (x, y), then the relation between x and y can be best described by (a) 3x + 2y = 5 (b) 6x + y = 8 (c) 5x – 2y = 4 (d) 2x – 5y = 4

mid point is 3/2,-1 and only 2nd option satisfies it

An urn contains 5 white and 8 black balls. Two successive drawings of 3 balls at a time are made such that the balls are not replaced before the second draw. Find the probability that the first draw gives 3 white balls and second draw gives 3 black balls.Please give a detailed explanation to this question. Pleaseee

let P(A) be selection of 3 white balls and P(B) be selection of 3 black balls. Lets us assume that in the first draw all the 3 balls are white.So the probability for getting 3 black balls in the Second draw given 3 white balls obtained in first draw is P(B/A)=P(A/B)*P(B)/P(A)But we have assumed the first draw. so the probablity of getting 3 white balls is P(A)So total probability is P(B/A)*P(A)=(P(A/B)*P(B)/P(A))*P(A)=P(A/B)*P(B)=(5c3/10c3)*P(8c3/13c3)=7/429