Boats and Streams – Aptitude test, questions, shortcuts
| 2. | A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man’s speed against the current is: | |||||||
Answer: Option C Explanation: Man’s rate in still water = (15 – 2.5) km/hr = 12.5 km/hr. Man’s rate against the current = (12.5 – 2.5) km/hr = 10 km/hr. |
| 3. | A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively? | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Answer: Option C Explanation: Let the man’s rate upstream be x kmph and that downstream be y kmph. Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.
= 8 : 3. |
| 4. | A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is: | ||||||||||||||||||||||
Answer: Option B Explanation: Let the speed of the stream be x km/hr. Then, Speed downstream = (15 + x) km/hr, Speed upstream = (15 – x) km/hr.
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| 5. | In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is: | |||||||||||
Answer: Option C Explanation:
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- Boats and Streams – Important Formulas
- Boats and Streams – Data Sufficiency 1
- Boats and Streams – Data Sufficiency 2