A sailor can row a boat 8 km downstream and return back to the starting point in 1 hr.40 min. If the speed of the stream is 2km/hr, find the speed of the boat in still water?

What are the differences between similar triangles and congruent triangles?

What are Armstrong numbers?

All real numbers are rational numbers.

A) True

B) False

The L.C.M of the smallest 2 digit composite number and the smallest composite number is:

• (a) 12
• (b) 4
• (c) 20
• (d) 44

Are all natural numbers also whole numbers?