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.

മിഷൻ ഇന്ദ്രധനുസ് പദ്ധതിയിൽ ഉൾപ്പെടുന്ന 7 രോഗങ്ങൾ

Code: ഇപ്പൊ ഭിക്ഷയ്ക്കു അവിടെ പോഡി .

ഇപ്പൊ ഭി - ഹെപ്പറ്റൈറ്റിസ് ബി .
ക്ഷ - ക്ഷയം .
അ - അഞ്ചാം പനി .
വി - വില്ലൻ ചുമ .
ടെ - ടെറ്റനസ് .
പോ - പോളിയോ .
ഡി - ഡിഫ്ത്തീരിയ.
...

Open

Problems on Train with Explanation and Shortcuts

Formula : .

Train Speed = Distance / Time.

Points to Remember .

To change km/hr into m/sec, we need to multiply it by 5 / 18. .

Example:.

90 km/hr means.

90 x 5 / 18.

= (5 x 5 ).

= 25 m/sec.

And if we need to convert m/sec into km/hr, we multiply it by 18 / 5.

Example:.

90 m/sec means.

90 x 18 / 5.

= ( 18 x 18 ).

= 324 km/hr.

Time taken by a train of length l meters to pass a pole or standing man or a signal post is equal to the time taken by the train to cover l meters.
Time taken by a train of length l meters to pass a stationary object of length b meters is the time taken by the train to cover (l + b) meters.
Suppose two trains or two objects bodies are mo...

Open

Divisibility Rule

What is the divisibility by 2 Rule?.
Even numbers are multiples of 2. A number is even if ends in 0,2,4,6, or 8.
What is the divisibility by 3 rule?.
A number is divisible by 3 if the sum of its digits is divisible by 3.
372, for instance, is divisible by 3 since sum of its digits (3+7+2) is 12. And 12 is divisible by 3.
What is the divisibility by 4 rule?.
A number is divisible by 4 if the number\'s last two digits are divisible by 4.
9,312, for instance, is divisible by 4 since its last 2 digits are 12. And 12 is divisible by 4.
What is the divisibility by 5 rule?.
A number is divisible by 5 if its last digit is a 0 or 5.
What is the divisibility by 6 rule?.
Since 6 is a multiple of 2 and 3, the rules for divisibility by 6 are a combination of the rule for 2 and the rule for 3.
Divisibility by 8 Rule.
A number passes the test for 8 if the las...

Open

Tricks and Tips for Boat and Stream type Questions