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1. a km / hr = (a * 5/18) m/s.
2. a m / s = (a * 18/5) km / hr.
3. Time taken by a train of length / meters to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover 1 meters.
4. Time taken by a train of length / meters to pass a stationary obje...

Published: 12 Aug 2019

1. In water, the direction along the stream is called downstream. And the direction against the stream is called upstream.
2. Let the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then
Speed downstream = (u + v) km/hr
...

Published: 12 Aug 2019

Compound interest (or compounding interest) is interest calculated on the initial principal, which also includes all of the accumulated interest of previous periods of a deposit or loan.
P = principal amount (the initial amount you borrow or deposit)
r = annual rate of interest (as a deci...

Published: 12 Aug 2019

1. Principal : The money borrowed or lent out for a certain period is called the principal or the SUM.
2. Interest : Extra money paid for using other’s money is called interest. Interest is the extra money paid by the borrower to the owner (lender) as a form of compensation for the us...

Published: 12 Aug 2019

1. Partnership :
When two or more people joins hands with a common goal to attain profits or run a business jointly, they are called Partners and the deal is known as Partnership . Every partner invests either time, money or his patents to help partnership firm to reap profits.
2. Ra...

Published: 06 Aug 2019

Basic Definitions and Formulas
Cost price (C.P.) : This is the price at which an article is purchased.
Selling price(S.P.) : The price at which an article is sold, is called its selling price,
Profit or Gain : If S.P. is greater than C.P. , the seller is said to have a profit or gain....

Published: 06 Aug 2019

1. Concept of percentage : Percent implies “for every hundred” and the sign % is read as percentage and x % is read as x per cent. In other words, a fraction with denominator 100 is called a per cent. For example, 20 % means 20/100 (i.e. 20 parts from 100). This can also be written ...

Published: 06 Aug 2019

1. Ratio: We use ratios to make comparisons between two things. When we express ratios in words, we use the word "to"--we say "the ratio of something to something else." Ratios can be written in several different ways: as a fraction, using the word "to", or with a ...

Published: 06 Aug 2019

1. BODMAS Rule : This rule depicts the correct sequence in which the operation are to be executed, so as to find out the value of a given expression.
BODMAS is a short form for Bracket, Of, Division, Multiplication, Addition and Subtraction. In some regions, PEDMAS (Parentheses, Exponents, D...

Published: 23 Jul 2019