20. Three mark exercise problems V

1. The product of \(2\) two digit numbers is \(300\) and their HCF is \(5\). What are the numbers?

 

 

The two numbers are (5,60)(60,2)(15,20)(10,30).

 

2. Wilson, Mathan and Guna can complete one round of a circular track in \(10\), \(15\) and \(20\) minutes respectively. If they start together at \(7 \ a.m\) from the starting point, at what time will they meet together again at the starting point?

 

 

Wilson, Mathan and Guna will meet together again at After \(60\) minutes, at \(8 \ a.m\)After \(3\) hours at \(10 \ a.m\)After \(25\) minutes, at \(7:25 \ a.m\)After \(6\) hours at \(1 \ p.m\)