Question
A train covers a certain distance at a speed of 72 km/h
and the next same distance with a speed of 90 km/h and the next same distance with a speed of 120 km/h. find the average speed?Solution
Since the distance is same in all the conditions. Therefore, Average speed = 3xyz/(xy + yz + zx) Average speed = 3 x 72 x 90 x 120/(72 x 90 + 90 x 120 + 120 x 72) Average speed = 3 x 72 x 90 x 120/(6480 + 8640 + 8640) = 2332800/25920 = 90 km/hr
If 'O' is 'M's daughter; 'N' is 'O's brother; 'K is 'N's father and 'F' is 'K's mother, then how is F related to 'M'?
In a family, E is the father of H, F is the mother of I, H is the brother of I and G is married to H. Who is the father-in-law of G?
Answer the questions based on the information given below.
Six persons M, N, O, P, Q and R live in a family of three generations. M is married ...
If L has only one son then how is O related to M?
Which, among the following option(s) , is/are definitely true?
Answer the questions based on the information given below.
Nine persons R, S, T, U, V, W, X, Y and Z live in a family of three generations. V i...
Which of the following statements is/are definitely correct?
How is W related to mother of Z?
How is R related to S’s brother?
How is G related to F?
Relevant for Exams:
