A train 100 metres long passes a bridge at the rate of 72 km / hr in 25 seconds. What is the le

step 1 Hi, here in this given problem, length of the train that is given as let it be represented by L1

A train 100 metres long passes a bridge at the rate of 72...

A train 100 metres long passes a bridge at the rate of $72 \mathrm{~km} / \mathrm{hr}$ in 25 seconds. What is the length of the bridge?
(a) $400 \mathrm{~m}$
(b) $17 \mathrm{~m}$
(c) $600 \mathrm{~m}$
(d) None of these

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Relative Motion and Combined Lengths

When dealing with moving objects such as a train passing a stationary object, it is important to recognize that the total distance covered during the passing process is the sum of the moving object's length and the length of the stationary object. This understanding helps in accurately setting up the problem for solution.

Formulation of Linear Equations

In many motion problems, setting up an algebraic equation that relates the different known and unknown quantities is crucial. This allows for solving the problem systematically by expressing the total distance in terms of individual segments, such as the lengths of objects or gaps encountered during motion.

Unit Conversion

This concept involves converting measurements from one unit to another to ensure consistency in calculations. When dealing with speeds given in kilometers per hour, it is often necessary to convert them to meters per second or another compatible unit based on the context of time and distance measurements.

Distance-Speed-Time Relationship

The fundamental relationship between distance, speed, and time is essential in solving problems where one of these quantities is unknown. It states that the distance traveled is equal to the product of speed and time, which can be used to relate the dimensions in motion problems.

Transcript

Please give Ace some feedback