Question

ravi and John are standing 300m apart. if they run towards each other with the speed of 2m/s and 1m/s respectively, how much will they take yo cross each other.

Answer 1

Given :

Ravi & John are 300 m apart

velocity of ravi is 2m/s & Velocity of john is 1 m/s

To Find :

Time at which they will cross each other

Solution :

•Let time taken by them to cross each other is t seconds

•Since , Distance = speed × time

•Distance travelled by ravi in t seconds = speed x time = 2×t

= 2t metres

•Distance travelled by John in t seconds = speed × time

= 1×t = t metres

•Now , Sum of distance travelled by both ravi & john will be 300 m

•or In 300 metres some distance will be travelled by Ravi & rest by John

•so, Distance travelled by ravi = 300- distance travelled by John

2t = 300 - t

3t = 300

t = 100 seconds

•After t = 100 seconds ravi & john will cross each other

Answer 2

Time take to cross each other = 100 sec.

Given:

Ravi and John are standing 300m apart.

They run towards each other with the speed of 2m/s and 1m/s respectively,

To find:

How much will they take to cross each other.

Concept used:

Relative speed.

Speed of moving object with respect to another object.

If object moving in same direction Relative speed can be calculated from subtracting their speed. If object moving in opposite direction Relative speed can be calculated from Added their speed.

Explanation:

From above concept it is clear that

Relative speed Between ravi and john = 2+1 = 3 m/s

Distance between those = 300 m

Time = $\frac{Distance }{Speed}$

Time = $\frac{300 }{3}$ = 100 sec.

Time take to cross each other = 100 sec.

To learn more...

1)The relative velocity of two trains travelling in opposite directions is calculated by adding their velocities. In case, the trains are travelling in the same direction, the relative velocity is the difference between their velocities. Write a program to input the velocities and length of the trains. Write a menu driven program to calculate the relative velocities and the time taken to cross each other by indicating 1 for same direction and 2 for opposite direction.​

https://brainly.in/question/10583806

2)What is relative velocity.

https://brainly.in/question/5195582