A boat travelling upstream takes 8 hours 48 minutes to cross a given distance, whereas a boat travelling downstream takes 4 hours. What is the relationship between the boat's speed and the speed of the water current?
A. 2 : 1
B. 3 : 2
C. 8 : 3
D. Cannot be determined
Answer:C
A boat travelling upstream takes 8 hours 48 minutes to cross a given distance, whereas a boat travelling downstream takes 4 hours. What is the relationship between the boat's speed and the speed of the water current?
A. 2 : 1 B. 3 : 2 C. 8 : 3 D. Cannot be determined
Explanation: Let's say the man's upstream speed is x kmph and his downstream speed is y kmph.The distance travelled upstream in 8 hours 48 minutes is equal to the amount travelled downstream in 4 hours.4/5 = x x 8 (y x 4),4y = 44/5 x,11/5 x Equals y,y + x/2 : y - x /2 is the required ratio.= 16x/5 x 1/2 : 6x/5 x 1/2 = 8/5 : 3/5= 8 to 3.