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A river 4 miles wide is following at the rate of 2 miles /hr. The minimum time taken by a boat to cross the river with a speed of 4 miles/hr is approximately

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3 years ago

John Sharon Sandeep
41 Points
```							Here speed of river=2mph.        Speed of boat in still water=4mph.    Therefore speed of the boat in the flowing river=2mph+4mph=6mph.    Since distance=4miles  ,  by S=D/T  ,  6mph=4m/T =>  T= 4/6 h = 40 minutes.☺
```
3 years ago
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Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions