Tricks and Tips for Boat and Stream type Questions

Shortcut tricks on boats and streams are one of the most important topics in exams. These are the formulas and examples on Boats and Streams (Cyclist and the wind or Swimmer and stream) questions. These examples will help you to better understand shortcut tricks on boats and streams questions.

There are multiple types of questions asked from these topics.

The speed of the boat in still water and the speed of stream will give in questions, You have to find the time taken by boat to go upstream and downstream.
The speed of the boat in up and down stream will give in question, you need to find the average speed of the boat.
The speed of boat to go up or down the stream will give in question, you need to find speed of boat in still water and speed of stream
The time taken by boat to reach a place in up and downstream will given in question, you need to find the distance to the place

Basic Formulas

In water, the direction along with stream is called Downstream.
The direction of the boat against the stream is called Upstream.
The speed of boat or man in calm water which we denoted by sb.
The speed of water or stream that denoted by sw.
Speed of boat in downstream (along the river) = (sb + sw)
Speed of boat in upstream (against the river) = (sb - sw)
Speed of boat in still water ss = ½(sb + sw)
Speed of water current (Rate of stream) sc = ½(sb – sw)

Sample Questions

A man can row 18km/hr in still water. the speed of the man in downstream is thrice the speed in upstream. Find the rate of the stream?.

Let assume, Speed of man in upstream = x

Speed of man in downstream = 3x

Speed of man in still water ss = ½( x + 3x)

= 2x

We know speed of man in still water = 18

ie, x = 9

Rate of stream = ½(27 – 9) =9 km/hr.

അക്ബറിന്റെ നിർമ്മിതികൾ

അക്ബറിന്റെ നിർമ്മിതികൾ .

കോഡ് - ALFI യ്ക്ക് BP യുണ്ട്.

A - ആഗ്രാ കോട്ട, അഹമ്മദാബാദ് കോട്ട.
L - ലാഹോർ കോട്ട.
F - ഫത്തേപ്പൂർ സിക്രി (ചെങ്കല്ലിലെ ഇതിഹാസം).
I - ഇബാദത്ത് ഘാന (ഫത്തേപൂർ സിക്രിയിലെ ആരാധനാലയം).
B - ബുലന്ദ് ദർവാസ (ഫത്തേപൂർ സിക്രിയുടെ പ്രവേശന കവാടം).
P - പഞ്ച് മഹൽ.

അക്ബറുടെ ശവകുടീരം സ്ഥിതിചെയ്യുന്നത് - സിക്കിന്ദ്ര (ആഗ്ര) .
അക്ബർ ന...

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Time and Work Problems - Shortcut Tricks and Formulas

Problems Type 1: .

A can finish work in X days. .

B can finish work in Y days.

Both can finish in Z days = (X*Y) / (X+Y). .

Problems Type 2: .

Both A and B together can do work in T days.

A can do this work in X days.

then, B can do it in Y days = (X*T) / (X-T) .

Problems Type 3: .

A can finish work in X days.

B can finish work in Y days.

C can finish work in Z days.

Together they can do work in T days = (X*Y*Z)/ [(X*Y)+(Y*Z)+(X*Z)] .

Problems Type 4: .

A can finish work in X days.

B can finish work in Y days.

A*X = B*Y.

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BODMAS Rule

BODMAS is an acronym and it stands for Bracket, Of, Division, Multiplication, Addition and Subtraction. .

This explains the order of operations to solve an expression. According to Bodmas rule, if an expression contains brackets ((), {}, []) we have to first solve/simplify the bracket followed by of (powers and roots etc.), then division , multiplication , addition and subtraction from left to right. .

Example :.

7 + (6 × 52 + 3) = 7 + (6 × 25 + 3).

7 + (150 + 3).

7 + (153).

7 + 153 .

Ans: 160. .

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Tricks and Tips for Boat and Stream type Questions