Question
A boat covers 12 km upstream and 20km downstream in 4
hours while it covers 20km upstream and 12 km downstream in 4*1/2 hours. What is the velocity of current?Solution
Let the speed of upstream be x km/hr Speed of downstream = y km/hr 12/x+20/y= 4 ………….(i) 20/x+12/y=4 1/2…………………….(ii) Adding (i) and (ii), we get 32(1/x+1/y)=17/2…………..(iii) Subtract (i) from (ii), we get 8(1/x-1/y)=1/2…………..(iv) Adding (iii) and (iv), we get 2/x=17/64+ 1/16 2/x = 21/64 x = 128/21 km/hr Now, 21/128 - 1/y = 1/16 y = 128/13 km/hr Now, rate of current = 1/2(128/13-128/21) =1.8 Km/hr
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?
