Question
A boat can travel 10 km more in downstream than that in
upstream, in 5 hours while the difference between the time taken by the same boat to travel 250 km and 126 km, in still water, is 4 hours. Find the approximate time taken by the boat to travel 233 km in downstream and 100 km in upstream.Solution
Let the speed of boat in still water and speed of stream be 'x' km/hr and 'y' km/hr, respectively. According to question; (250/x) - (126/x) = 4 Or, (124/x) = 4 So, x = 31 Now, 5 x (31 + y) = 5 x (31 - y) + 10 Or, 155 + 5y = 155 - 5y + 10 Or, 10y = 10 So, y = 1 So, downstream speed of the boat = (31 + 1) = 32 km/hr And, upstream speed of the boat = (31 - 1) = 30 km/hr Required time taken = (233/32) + (100/30) ~ (7 + 3) ~ 10 hours
What is the position of P with respect to her sister?
Six persons are sitting in two straight rows, facing north. Their names are A, B, C, D, E and F. A and F are sitting at diagonally opposite ends. B is i...
Which of the following statement is not true before the final arrangement?
Which of the following statements is definitely false?
Six friends are sitting in a straight line. E is 4th from the right. E is between B and D. A is adjacent to B. D is adjacent to C. D is between E and C....
Five friends, D, E, F, G and H, are sitting in a straight line. D and E are adjacent to each other. E is between D and F. D is third to the left of G. G...
Who among the following person sits fourth to the left of G?
What is the position of F with respect to H?
Who among the following person sits opposite to H?
X has tuition centre in which place?
Relevant for Exams:
