Arun sells an article at a certain price had she sold it 3/5 of that selling price, she would have lost 20%. what is the gain percentage when she sells it at 90% of the original selling price?

Question

A boat takes 14 minutes to travel 8.4 km upstream if the ratio of the speed of the board to that of the stream is 6:1 then how much time in minutes will the boat take to travel 33.6 km downstream

Answer 1

Given:

8.4km upstream in 14 minutes. 

Speed of a boat in still water : Speed of a stream = 6 : 1 

Let the speed of a boat in still water be 6x,

Speed of a stream be x

Speed in upstream direction, x – y

⇒ 6x – x 

⇒ 5x

Speed = Distance/Time 

⇒ 5x = 8.4km/14 min

⇒ 5x = 0.6km/min

⇒ x = 0.6/5 km/min

Speed in downstream direction, x + y

⇒ 6x + x

⇒ 7x

Putting the value of x,

⇒ 7 × 0.6/5

⇒ 4.2/5

Distance to travel in downstream is 33.6 km

Using the formula,

⇒ 4.2/5 = 33.6/Time

⇒ Time = (33.6 × 5)/4.2

⇒ Time = 40 minutes

∴ Time required to cover 33.6 km distance is 40 minutes.