The speed of a boat in still water is 25 km/h. It takes 33% more time to cover a certain distance in still water than to cover the same distance downstream. How much time (in hours) will the boat take to go 75 km downstream?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 2.25.
Time taken by boat in Still water = 33% = 3/100 × 1/100 = 1/3
Speed Ratio = 3 : 4
The boat speed in downstream = 25 × 4/3
Time is taken by boat in downstream = 75/((25 × 4)/3)
⇒ (75 × 3)/(25 × 4) = 9/4 = 2.25 hr