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A bent can row 15 km per hour downstream and 9 km per hour upstream. The speed (in km/hour) of the boat in still water is:
- a)8
- b)15
- c)12
- d)10
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A bent can row 15 km per hour downstream and 9 km per hour upstream. T...
Given:
A bent can row 15 km per hour downstream
Upstream = 9 km/h
A bent can row 15 km per hour downstream
Upstream = 9 km/h
Formula Used:
Upstream = x − y
Downstream = x + y
Upstream = x − y
Downstream = x + y
Calculations:
Let the speed of the boat be x km/h
The speed of still water = y km/h
According to the formula,
⇒ x − y = 9 .......(1)
⇒ x + y = 15 ......(2)
On adding the eq (1) and eq (2), we get
⇒ x − y + x + y = 9 + 15
⇒ 2x = 24
⇒ x = 12 km/h
Hence, The speed of the boat in still water is 12 km/h.
Let the speed of the boat be x km/h
The speed of still water = y km/h
According to the formula,
⇒ x − y = 9 .......(1)
⇒ x + y = 15 ......(2)
On adding the eq (1) and eq (2), we get
⇒ x − y + x + y = 9 + 15
⇒ 2x = 24
⇒ x = 12 km/h
Hence, The speed of the boat in still water is 12 km/h.
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A bent can row 15 km per hour downstream and 9 km per hour upstream. The speed (in km/hour) of the boat in still water is:a)8b)15c)12d)10Correct answer is option 'C'. Can you explain this answer?
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