Arithmetic1

Conversion of speed: The below table shows the Conversion from km/hr to m/s .for converting km/hr to m/s,we need to multiply with the conversion factor of 5/18. The table shows the speed in 9 km/hr to 180 km/r converted speed in m/s from 2.5m/s to 50m/s Sl No Speed in km/hr Conversion factor Speed in m/s 1 9 5/18 2.5 2 18 5/18 5 3 27 5/18 7.5 4 36 5/18 10 5 45 5/18 12.5 6 54 5/18 15 7 63 5/18 17.5 8 72 5/18 20 9 81 5/18 22.5 10 90 5/18 25 11 99 5/18 27.5 12 108 5/18 30 13 117 5/18 32.5 14 126 5/18 35 15 135 5/18 37.5 16 144 5/18 40 17 153 5/18 42.5

arithmetic: Time when the hands of the clock meet together. : In all competitive exams questions on clock are common In this we will dicuss on question. At what time the hands of a clock be togeth....

In all competitive exams questions on clock are common In this we will dicuss on question. At what time the hands of a clock be together?. The explanation for this question is Given in below table. Sl No Hours Fraction part Fraction part simplified Time when the hands of a clock meet together 1 1-2 60/11 5    5/11 5    5/11 min past 1 2 2-3 120/11 10  10/11 10  10/11 min past2 3 3-4 180/11 16   4/11 16   4/11 min past 3 4 4-5 240/11 21  9/11 21   9/11 min past 4 5 5-6 300/11 27  3/11 27   3/11 min past 5 6 6-7 360/11 32  8/11 32   8/11 min past 6 7 7-8 420/11 38  2/11 38   2/11 min past 7 8 8-9 480/11

In previous post we learned how to write prime numbers. by seeing the prime number table we know that 25 prime numbers are existing in between 1 to 100 the following table explains Prime numbers 1-25 2,3,5,7,11,13,17,19,23 9 26-50 29,31,37,41,43,47 6 51-75 53,59,71,73,61,67 6 75-100 79,83,89,97 4 uestions   in the above table shows that from 1 to 25 numbers there are 9 prime numbers similarly from 25 to 50 there are 6 prime numbers are there.like wise from 51-75 there are 6 prime numbers and from 75 to 100 there are 4 prime numbers there. some times questions are like this. what is the sum of prime numbers between 1 to  25? the following table shows the sum of prime numbers Prime numbers sum 1-25 2+3+5+7+11+13+17+19+23 100 26-50 29+31+37+41+43+47 228 51-75 53+59+71+73+61+67 384 75-100 79+83+8