Question

A train travels with a speed of 60 km h−1 from station A to station B and then comes back with a speed 80 km h−1 from station B to station A. i) The average speed  and ii) the average velocity of the train.​

Answer 1

Step-by-step explanation:

Question:-

A train travels with a speed of 60 km h−1 from station A to station B and then comes back with a speed 80 km h−1 from station B to station A. i) The average speed  and ii) the average velocity of the train.

Answer:-

Given:-

• The train travels with a speed of 60 km/ h
• The train comes back with a speed 80 km/ h

To find:-

• The average speed of the train
• The average velocity of the train.

Solution:-

Let distance from A to B = x km = distance from B to A.

$Time \: taken \: by \: train \: from \: A \\ to \: B  \: = \: \frac{x}{60}  hr$

$Time \: taken \: by \: train \:   from \: B \\ to \: A \:  = \: \frac{x}{80}  hr$

$Total \: time \: taken \: by \: train  \\ = \frac{x}{60} + \: \frac{x}{80} \: = \: \frac{7x}{240}$

$= \: \frac{480}{7} \: km \: h {}^{ - 1} \: (ans)$

Answer 2

Step-by-step explanation:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Hope it's helpful.