Question : The speed of the boat down the stream is 125% of the speed in still water. If the boat takes 30 minutes to cover 20 km in still water, then how much time (in hours) will it take to cover 15 km upstream?
Option 1: $\frac{3}{4}$
Option 2: $\frac{1}{2}$
Option 3: $\frac{1}{4}$
Option 4: $1$
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: $\frac{1}{2}$
Solution : Speed of boat in still water = $\frac{20}{\frac{30}{60}}= 40$ km/hr Speed of boat downstream = $50$ km/h (As it is $125$% more than the speed of the boat in still water) Speed of current = $50 - 40$ = $10$ km/hr The time it will take to cover $15$ km upstream $=\frac{\text{Distance}}{\text{Speed in still water – speed of current}}=\frac{15}{30} = \frac{1}{2}$ hour Hence, the correct answer is $\frac{1}{2}$.
Candidates can download this ebook to know all about SSC CGL.
Answer Key | Eligibility | Application | Selection Process | Preparation Tips | Result | Admit Card
Question : A boat can cover 120 km upstream and back in a total of 30 hours, and 25 km upstream and 40 km downstream in a total of 7 hours. How much distance will the boat cover in 16 hours in still water?
Question : A boat goes 20 km upstream and 44 km downstream in 8 hours. In 5 hours, it goes 15 km upstream and 22 km downstream. Determine the speed of the boat in still water.
Question : A boat moves downstream at the rate of 1 km in $7\frac{1}{2}$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?
Question : A boat covers a distance of 80 km downstream in 8 hours, while it takes 10 hours to cover the same distance upstream. What is the speed (in km/hr) of the boat in still water?
Question : A boat goes 4 km upstream and 4 km downstream in an hour. The same boat goes 5 km downstream and 3 km upstream in 55 minutes. What is the speed (in km/hr) of the boat in still water?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile