Relative speed is the phenomena that we observe daily whenever two objects are moving simultaneously. Suppose you are travelling in train an there is second train coming in opposite direction on a parallel track. It seems second train is moving much faster than it actually is. On the other hand I you are travelling in

Example 1: Ram has a run up of 100 m. if the speed at which he runs at 36 km/hr how much time does he take to complete his run up? Now first convert speed into m/s So 36 km/hr= 36 x 5/18= 10m/s Time = 100/10= 10 sec Example 2: A man cover certain

Speed: Speed is nothing but the rate at which certain distance is covered. Thus the basis relationship between time, speed and distance is Speed= Distance covered/ Time taken Unit of speed will be either in meter/sec or km/hour. 1 km/hr=5/18meter/sec 1 meter/sec=18/5 km/hr For Example: If A person moves from A to B travelling at

Example 1: A man purchase 11 pens for Rs 10 and sells 10 pens for RS 11. How much profit or loss he makes? Suppose the person bought 11 x10=110 pen CP of 110 pen= 10/11 x100= Rs 100 SP OF 110 pens= 11/10 x100= Rs 121 Profit= 121-100= Rs 21 So percentage profit= 21/100

Profit, Loss and Discount: Cost Price: CP is the cost at which item is purchased. Selling Price: SP is the cost at which item is sold. Profit/Loss: This is the difference between selling price and cost price. If the difference is positive then it is called Profit. It the difference is negative then it is

Example 1: A sum of Rs 12,000 at simple interest amounts to Rs. 15,000 in3 years Find rate %. SI=15000-12000=3000Rs. SI= P*r*t/100 Rate= 3000*100/12000*3 =8.3% Example 2: what annual payment will discharge at a debt of Rs 750 due in 5 years, the rate of interest given is 5% per annum? Direct Formula Annual payment=

Whenever we keep any amount on bank we are paid interest. The interest is usually specified as, say4% per annum. 4 % Per annum means if money invested is 100then interest is 4 % i.e. 4 Rs every year. Principal: Which is denoted by P. The money lent for certain period is called principal. Amount:

Example 1 : Find 8 percent of Rs. 225. 8% of 225=8*225/100 2/25*225=18 Rs Example 2: Express 20, as a percentage of 40. 20/40 *100 =50% Example 3: The population of town has increased from 50,000 to 60,000, find increased percentage? Increase in population= 60,000-50,000=10,000 Percentage increase= 10,000/60,000 *100 =100/6% Example 4: In a basket

We all use percentage in our daily routine. The term percent mans for every hundred. In its simplest sense percent i.e. per hundred. Thus the expression 20% means 20/100 To express n% as a fraction: n%/100 To express a/b as percentage: (a/b x 100)% Thus 3/5= (3/5 x100)% =60% For example: India won 50% of

A Lot of students find Mathematics as a very difficult subjects as it involves mental exercise. Calculation speed plays very important role during competitive exams as lots of exams are based on speed test. Most of students are accustomed of using calculator during their graduation so they find difficult to calculate fast during competitive exams.