Maths > Boat & Stream > Flashcards

Boat & Stream Flashcards

(29 cards)

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1
Q

Terminology: Stream means

A

Moving water

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2
Q

Terminology: Upstream means

A

Travelling opposite to stream

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3
Q

Terminology: Downstream means

A

Travelling in stream direction

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4
Q

Speed of boat in still water ===

A

Boat speed

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5
Q

Boat speed ===

A

Speed of boat in still water

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6
Q

Upstream formula

A

x - y

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7
Q

Formula of x - y is for,

A

Upstream

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8
Q

Downstream formula

A

x + y

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9
Q

Formula of x + y is for,

A

Downstream

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10
Q

When D.S. and U.S. is given and asked to find boat speed in still water (x)

A

D.S. + U.S. / 2

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11
Q

When D.S. and U.S. is given and asked to find stream speed (y)

A

D.S. - U.S. / 2

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12
Q

Formula of D.S. + U.S. / 2 is for,

A

When D.S. and U.S. is given and asked to find boat speed in still water (x)

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13
Q

Formula of D.S. - U.S. / 2 is for,

A

When D.S. and U.S. is given and asked to find stream speed (y)

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14
Q

Variable of x is for

A

Speed of the boat in still water / boat speed

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15
Q

Variable of y is for

A

Stream speed

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16
Q

Variable for “Speed of the boat in still water / boat speed”

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A

x is the variable for

17
Q

Variable for “Stream speed”

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A

y is the variable for

18
Q

(Up and Down)
Total time =

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A

2Dx / x² - y²

[x² - y² = (x+y) (x-y)]

19
Q

(Up and Down)
Average speed =

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A

x² - y² / x

20
Q

(Up and Down)
Difference in time =

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A

2Dy / x² - y²

[x² - y² = (x+y) (x-y)]

21
Q

(Up and Down)
Speed of the boat in still water =

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A

y(t₂ + t₁) / t₂ - t₁

22
Q

(Up and Down)
Ratio of speed of boat and speed of stream =

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A

x / y = t₂ + t₁ / t₂ - t₁

23
Q

2Dx / x² - y²

[x² - y² = (x+y) (x-y)]
It is the formula of,

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A

Total time, travelling Up and Down

24
Q

x² - y² / x, It is the formula of,

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A

Average speed, travelling Up and Down

25
2Dy / x² - y² [x² - y² = (x+y) (x-y)] It is the formula of,
Difference in time, travelling Up and Down
26
y(t₂ + t₁) / t₂ - t₁, it is the formula of,
Speed of the boat in still water, while travelling Up and Down.
27
x / y = t₂ + t₁ / t₂ - t₁, it is the formula of,
Ratio of speed of boat and speed of stream, while travelling Up and Down.
28
2Dx / x² - y² 2Dy / x² - y² [x² - y² = (x+y) (x-y)] Those are the formula of, What does D, x, y means,
To find Total time To find Diff. in time D means Distance x means B.S. - Boat Speed y means S.S. - Stream Speed
29
Name the formulas of Boat & Stream
- Boat - Stream - Upstream - Downstream - Boat speed in still water - Stream speed (Up & Down) - Total time - Average speed - Diff. in time - Speed of Boat in still water - Ratio of Speed of Boat : Speed of Stream
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