Server Error

Server Not Reachable.

This may be due to your internet connection or the nubtrek server is offline.

Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.
mathsCommercial ArithmeticsRate and Span

### Speed, Time, Distance

An example to the rate xx span = aggregate, is
speed xx time = distance.

This is explained in detail.

click on the content to continue..

A train covers 102km in 3 hours. What is the speed of the train?

• 34 km/hour
• 34 km/hour
• 102 km/hour

The answer is "34 km per hour".

Unitary method in Speed-Time-Distance:
The distance traveled in 1 unit time is the speed.

A train covers 102km in 3 hours.
The speed of the train is 102/3 =34 km per hour.

How much time does a train, at the speed of 60 km per hour, take to cross 240km?

• 4 hours
• 4 hours
• 8 hours

The answer is "4 hours".

Speed xx time = distance.

Speed and distance are given. Time is to be calculated.

What distance a train at the speed 50 km per hour covers in 7 hours?

• 350 km
• 350 km
• 350 hours

The answer is "350 km"

Speed xx time = distance.

Speed and time are given. Distance is to be calculated.

A car takes 3 mins to cross a distance 30 meters. How much distance it would cover if it travels for 22 mins?

• 220 meter
• 220 meter
• 660 meter

The answer is "220 meter"

Speed xx time = distance.
Time and Distance are in direct variation.

A car going at the speed 10 meter per second crosses 25 meters in the given time. If the speed is increased to 12 meter per second, what distance it travels in the same time?

• 30 meters
• 30 meters
• 10xx25//12 meter

The answer is "30 meters"

Speed xx time = distance.
Speed and Distance are in direct variation.

A car takes 3mins to cross a bridge at 10 meter per second. What is the time it takes to cross the bridge at 20 meter per second?

• 3 min
• 1.5 min
• 1.5 min

The answer is "1.5 min"

Speed xx time = distance.
Speed and time are in inverse variation.

Problems in Speed-Time-Distance : Simplify the problem to
speed xx time = distance

There are three quantities in the equation. Possible formulation of questions are

•  two quantities are given, and the third is asked.

•  two quantities are given. Under the condition that one of the given is modified, the changed second is asked. (direct or inverse variation)

slide-show version coming soon