Adozen of books are rs 680 at a profit of rs 140. what is the cost of one book?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute