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Teaching Exam  >  Teaching Questions  >  Speed of a boat in still water is 8 km/hr. Sp... Start Learning for Free
Speed of a boat in still water is 8 km/hr. Speed of the river is 2 km/hr. Time taken by it to go 60 km downstream is 
  • a)
    4 hrs. 
  • b)
    6 hrs. 
  • c)
    10 hrs. 
  • d)
    8 hrs. 
Correct answer is option 'B'. Can you explain this answer?
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Speed of a boat in still water is 8 km/hr. Speed of the river is 2 km/...
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Speed of a boat in still water is 8 km/hr. Speed of the river is 2 km/...
Given:
Speed of boat in still water = 8 km/hr
Speed of river = 2 km/hr
Distance to be covered = 60 km

To find: Time taken to cover 60 km downstream

Concept Used:
We know that downstream speed of boat = (speed of boat in still water) + (speed of river)
Downstream speed of boat = 8 + 2 = 10 km/hr

Formula used:
Time = distance/speed

Calculation:
Using the formula, time taken to cover 60 km downstream = 60/10 = 6 hrs

Therefore, the correct answer is option B) 6 hrs.
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Speed of a boat in still water is 8 km/hr. Speed of the river is 2 km/...
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Speed of a boat in still water is 8 km/hr. Speed of the river is 2 km/hr. Time taken by it to go 60 km downstream isa)4 hrs.b)6 hrs.c)10 hrs.d)8 hrs.Correct answer is option 'B'. Can you explain this answer?
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