Question

20. On a sunny Saturday morning, Joe took his new canoe to a river. Rowing 36 miles upstream in 3 hours and returning in two hours, what was the average speed of Joe's rowing and the average speed of the current?

Answer 1

201 Speed of 36 23 and = 2 het, speed of worent = miles/hours Joe's rowing = y miles / hours. .. Upstream speed = (y-) miles / hours Dowans trucom speed = ( +x) miles / bavors. Therefore, y-x Y-R=12 36 Y+R Ytr = 18 ② + ③ we get 9.24-12 y the = 18 27 = 30 ny - 15 put, y = 15 in ① we get x= 3 There bre, The average speed of Joe's ro coas 15 miles / hours The average speed of the current 3 miles / hours. aley or yta 11 or rowing

81 het, the number of quarters - the number of niekeles - 24 the number of pennies = 33-3x Therefore, 0.25 Xx + 0.05 X 97. + (33-34)X0-01 = 2.57 09, 0.25% + 0.17 + 0.33 -0.03X = 9.57 our, 0.322 2.57-0.33 on x - 2.24 0.32 = 7 Therefore, the neember of quarters = 7 the number of nieketes = 14 the number of pennies = 12