Question
A motor boat covers a certain distance downstream in a
river in 2 hours. It covers the same distance upstream in 2 hours and 30 minutes. If the speed of water is 3.5 km/h, then the speed of the boat in still water is:Solution
Let the speed of boat in still water be x km/hr and the distance be y km. Rate downstream = (x + 3.5) km/hr Rate upstream = (x – 3.5) km/hr According to the question, y/(x + 3.5) = 2 --- (i) y/(x – 3.5) = 5/2 --- (ii) On dividing equation (i) by (ii), (x – 3.5)/(x + 3.5) = 2/(5/2) = 4/5 5x – 16.5 = 4x + 15 x = 16.5 + 15 = 31.5 kmph
How many boxes are kept above the box with Orchid?
Who likes Daisy?
How many persons likes after the one who likes Papaya?
Statements:
A < B ≥ C > U = W; R < Q > L ≤ W = Y; Q > P
Conclusions:
I. B < P
II. C > R
On which of the following days the English exam was held?
Six friends B, C, D, E, F and G, have exam on six different days, starting from Monday and ending on Saturday, of the same week in the month. G has exa...
Four of the five among the following are similar in such a way to form a group, which one of following doesn’t belong to the group?Â
...Whose anniversary is on 27th of July?
What is the position of E with respect to D?
If C is related to A, D is related to E, in the same way to how G is related to?
