Question
Quantity I : A Alone can complete a work in 21
days. If be alone work for eight days and then leaves, then B alone can complete the remaining work in seven days.C 25% less efficient than A. If B&C work together for X days and then leave, then remaining work can be completed by A alone stays. Find the value of X. Quantity II . Train eight takes 24 seconds to cross a pole and 22nd to cross a man walking at the speed of 5.6 metre per second towards it. Train B travels 1 meter per second slower than train trainee and takes 25%. Less time than train need to cross a pole. If the speed of train B had been 7 meter per second less than the time taken by it to cross 114 metre long platform is ‘5a’. Find the value of aSolution
Let the efficiency of ‘A’ alone = y units/day Then, Total work = 21*y = 21y units Let the efficiency of B = z unit / day We have 8*z +7y = 21y z:y = 7:4 So the ratio of efficiency of B:A is 7:4. So the efficiency of B is = 7y/4 = 1.75y units / day Efficiency of C = 0.75y units/day Combined efficiency of B and C = 1.75y +0.75y = 2.5y units/day According to the question, 2.5y*x + 6*y = 21y 2.5x= 15 X=6 Quantity 2: Let the speed of the train A = y m/s Then the length of train ‘A’= 24*y = 24y mt. Relative speed of train A wrt man = (y+0.56) m/s Also length of the train A = (y+5.6)*20 = (20y+112) mt. So, 24y = 20y+112 Y=28 Speed of train A is 28 m/s. Speed of train B = 28-1 = 27m/s. Time taken by Train ‘B’ to cross pole = 24*0.75 = 18 sec So length of train ‘B’ = 18*27 =486mt. New speed of train ‘B’ = 27-7 = 20m/s Required time taken ‘B’ = (486+114)/20 = 30 seconds 5a=30sec a=6
Select the option that represents the letters that when sequentially placed from left to right in the blanks below, will complete the letter series.
...Select the option that represents the letters that, when placed from left to right in the same sequence in the blanks below, will complete the letter se...
Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.
a b _ d _ f g _ i _...
Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
p _ _ _ q r _ ...
Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
m _ _ _ n o _ ...
Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.
RQP, ONM, ____, IHG, FED, find the missing letters
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
G _ I _ K G H I _ K _ _ _ J K
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
OA, LG, IM, FS, (?)
...Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.
g _ _ _ h i _ ...
Relevant for Exams:
