(1). Relation between distance ,time and speed: Distance = speed x Time (2). To convert speed of any object from KMPH to MPS multiply the speed by = 1000 / 3600 =  5 / 18 (3). To convert speed of any object from MPS to KMPH multiply the speed by = 3600 / 1000…

Percentage:  A fraction whose denominator is 100 is called percentage. and The numerator of the fraction is called the rate percent. 1 . To express x% as a fraction: We have, x% = x/100       Thus, 30% = 30/100 =3/10 2 . To express fraction as percenta…