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  1. 8 kmph
  2. 5 kmph
  3. 10 kmph
  4. 14 kmph
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1 Answers

Option 1 : 8 kmph

Given:

Boat moves downstream at 2 km in 12 minutes and upstream at 1 km in 10 minutes

That is, boat moves downstream at 1 km in 6 minutes and upstream at 1 km in 10 minutes

Formula used:

Speed = Distance/Time

x = ½ (u + v); where, u is speed of rowing downstream, v is speed of rowing upstream and x is speed of boat in still water.

Calculation:

Downstream speed, u = 1/6 × 60 = 10 kmph

Upstream speed, v = 1/10 × 60 = 6 kmph

Thus, speed of boat in still water = x = ½ (u + v) = ½ (10+6) = 8 kmph
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Related Questions

In the following question, two statements are numbered as A and B. On solving these statements, we get quantities A and B respectively. Solve both quantities and choose the correct option. Quantity A: Superman and Batman in their boat are moving towards each other If Superman travel against the stream and Batman along the stream they are at a distance of 2300 km from each other. If the Speed of Stream is 20 km/h and Speed of Superman’s Boat is 100 km/h and Speed of Batman’s Boat is 130 km/h. Find the Time Taken to meet each other Quantity B: Tony Stark is flying in his suit 1 hour before Captain America with the speed of 200 km/h. If Captain America is chasing him in the boat which runs at a speed of 270 km/h against a stream which has speed of 20 km/h. Find the time in which he catches the Tony Stark.?
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