1. What is the speed of the train whose length is 210 metres?
I. The train crosses another train (Howrah Express/12869) of 300 metres length running in opposite direction in 10 seconds.
II. The train crosses another train (Howrah Express/12869) running in the same direction at the speed of 60 km/hr in 30 seconds.
A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are...
Tuesday, 15 July 2014
Sunday, 13 July 2014
IMPORTANT FORMULAS : PIPES AND CISTERN
Inlet:
A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.
Outlet:
A pipe connected with a tank or cistern or reservoir, emptying it, is known as an outlet.
If a pipe can fill a tank in x hours, then:
part filled in 1 hour = 1/x
If a pipe can empty a tank in y hours, then:
part emptied in 1 hour = 1/y
If a pipe can fill a tank in x hours and another pipe can empty the full tank in y hours (where y > x), then on opening both the pipes, then
the net part filled in 1 hour = (1/x - 1/y)
If a pipe...
Thursday, 10 July 2014
DATA SUFFICIENCY
1. What is the number?
I. The sum of the two digits is 8. The ratio of the two digits is 1 : 3.
II. The product of the two digit of a number is 12. The quotient of two digits is 3.
A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer
Ans - C
2. What is the two-digit number?
I. The difference between the two digits is 9.
II. The sum of the digits...
Wednesday, 9 July 2014
TIME AND DISTANCE : IMPORTANT FORMULAS
Speed, Time and Distance:
Speed = Distance/Time
Time = Distance/ speed
Distance = (Speed x Time)
km/hr to m/sec conversion:
x km/hr = x X (5/18) m/sec.
m/sec to km/hr conversion:
x m/sec = x X (18/5) km/hr.
If the ratio of the speeds of A and B is a : b, then the ratio of the
the times taken by then to cover the same distance is 1/a : 1/b or b : a.
Suppose a man covers a certain distance at x km/hr and an equal distance at y km/hr. Then,
the average speed during the whole journey is: [2xy/(x + y)] km/hr.
...
Sunday, 6 July 2014
TIME AND WORK: IMPORTANT FORMULAS
Work from Days:
If A can do a piece of work in n days, then A's 1 day's work =1/n
Days from Work:
If A's 1 day's work =1/n,then A can finish the work in n days.
Ratio:
If A is thrice as good a workman as B, then:
Ratio of work done by A and B = 3 : 1.
Ratio of times taken by A and B to finish a work = 1 : 3.
...
Thursday, 3 July 2014
PROBABILITY : IMPORTANT FORMULAS
Experiment:
An operation which can produce some well-defined outcomes is called an experiment.
Random Experiment:
An experiment in which all possible outcomes are know and the exact output cannot be predicted in advance, is called a random experiment.
Examples:
# Rolling an unbiased dice.
# Tossing a fair coin.
# Drawing a card from a pack of well-shuffled cards.
# Picking up a ball of certain colour from a bag containing balls of different colours.
Details:
[1] When we throw a coin, then either a Head (H) or a Tail (T) appears.
[2] A dice...
Tuesday, 1 July 2014
DATA SUFFICIENCY
1. A shopkeeper sells some articles at the profit of 25% on the original price. What is the exact amount of profit? To find the answer, which of the following information given in Statements I and II is/are necessary?
I. Sale price of the article
II. Number of articles sold
A. Only I is necessary
B. Only II is necessary
C. Either I or II is necessary
D. Both I and II are necessary
E. None of these
Ans - D
2. A shopkeeper sells some toys at Rs. 250 each. What percent profit does he make? To find the answer, which of the following information given...
Subscribe to:
Posts (Atom)