26.5. A boy takes 4 h to cover certain distance alongthe flow and take

1.	26.5. A boy takes 4 h to cover certain distance alongthe flow and takes 6 h to cover the same distanceopposite to flow. In how much time, he will crossthis distance in still water?(1) 4.5 h(2) 5 h(3) 2.4 h(4) 4.8 hplz give explanation
Answer» Answer: 4.8 hr Explanation: Let day Distance = D Speed in still WATER = X km/Hr Speed of River = R km/Hr Along the flow Speed = X + R km/hr Time Taken = D/(X + R) = 4 Against the flow Speed = X - R km/hr Time Taken = D/(X - R) = 6 => (X+R)/(X - R) = 6/4 => (X+R)/(X - R) = 3/2 => 2X + 2R = 3X - 3R => X = 5R D/(5R + R) = 4 => D = 24R time to cross same distance in still water D/X = 24R/5R = 4.8 hr

26.5. A boy takes 4 h to cover certain distance alongthe flow and takes 6 h to cover the same distanceopposite to flow. In how much time, he will crossthis distance in still water?(1) 4.5 h(2) 5 h(3) 2.4 h(4) 4.8 hplz give explanation

Answer»

Answer:

4.8 hr

Explanation:

Let day Distance = D

Speed in still WATER = X km/Hr

Speed of River = R km/Hr

Along the flow Speed = X + R km/hr

Time Taken = D/(X + R) = 4

Against the flow Speed = X - R km/hr

Time Taken = D/(X - R) = 6

=> (X+R)/(X - R) = 6/4

=> (X+R)/(X - R) = 3/2

=> 2X + 2R = 3X - 3R

=> X = 5R

D/(5R + R) = 4

=> D = 24R

time to cross same distance in still water

D/X = 24R/5R = 4.8 hr

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26.5. A boy takes 4 h to cover certain distance alongthe flow and takes 6 h to cover the same distanceopposite to flow. In how much time, he will crossthis distance in still water?(1) 4.5 h(2) 5 h(3) 2.4 h(4) 4.8 hplz give explanation​

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26.5. A boy takes 4 h to cover certain distance alongthe flow and takes 6 h to cover the same distanceopposite to flow. In how much time, he will crossthis distance in still water?(1) 4.5 h(2) 5 h(3) 2.4 h(4) 4.8 hplz give explanation