A motorboat registers a speed of 15 km/h in still water. It takes 4 hours to cover a certain distance upstream. If the stream velocity is 3 km/h, find the distance covered. MCQ with Answer and Explanation
A motorboat registers a speed of 15 km/h in still water. It takes 4 hours to cover a certain distance upstream. If the stream velocity is 3 km/h, find the distance covered.
A. 52 km
B. 44 km
C. 56 km
D. 48 km
Answer: Option D
Solution (By JKSSB Mock Tests)
Upstream speed = 15 - 3 = 12 km/h. Distance = Upstream speed * Time = 12 * 4 = 48 km.
The speed of two cars are in the ratio 3 : 4. If the second car takes 3 hours to cover a certain distance, how much time will the first car take to cover the same distance?
Explanation:
Ratio of speeds = 3:4. Ratio of time taken (inverse of speed) = 4:3. Given 3 parts = 3 hours for the second car. Thus, 4 parts = 4 hours for the first car.
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