Question : A boat running downstream covers a distance of 20 km in 2 hours, while it covers the same distance upstream in 5 hours. Then, the speed of the boat in still water is:
Option 1: 7 km/hr
Option 2: 8 km/hr
Option 3: 9 km/hr
Option 4: 10 km/hr
Correct Answer: 7 km/hr
Solution : Given: A boat running downstream covers a distance of 20 km in 2 hours, while it covers the same distance upstream in 5 hours. Downstream speed = $\frac{20}{2}=10$ km/hr Upstream speed = $\frac{20}{5}=4$ km/hr By applying the formula, we have, The speed of the boat in still water = $\frac{\text{Downstream speed}+\text{Upstream speed}}{2}$ ⇒ The speed of the boat in still water = $\frac{10+4}{2}=7$ km/hr Hence, the correct answer is 7 km/hr.
Result | Eligibility | Application | Selection Process | Cutoff | Admit Card | Preparation Tips
Question : A boat covers a distance of 72 km downstream in 6 hours, while it takes 12 hours to cover the same distance upstream. What is the speed of the boat in still water?
Question : A boat covers 24 km upstream and 36 km downstream in 6 hours, while it covers 36 km upstream and 24 km downstream in $6\frac{1}{2}$ hours. The speed of the current is:
Question : A boat can go 40 km downstream and 25 km upstream in 7 hours 30 minutes. It can go 48 km downstream and 36 km upstream in 10 hours. What is the speed (in km/hr) of the boat in still water?
Question : The speed of a boat in still water is 15 km/hr, and the speed of the current is 5 km/hr. In how much time (in hours) will the boat travel a distance of 60 km upstream and the same distance downstream?
Question : A boat goes 2 km upstream and 3 km downstream in 20 minutes. It goes 7 km upstream and 2 km downstream in 53 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