Amotorboat takes 4 hours to travel 192 kilometers the return trip takes 3 hours downstream what is the rate of the boat in still water and what is the rate of the current ?

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

Anew test for ra is being developed. the test is administered to 750 patients with ra and 750 without ra. for the sake of the question, assume the prevalence of ra in this population is 50%. of the 750 patients with ra, 575 have a positive result. of the 750 patients without ra, 150 have a positive result. what is the positive predictive value of the new test? a575/(575+150) b. 600/(600+ 150) c. 575/(575+125) d. 600/(600+ 125)