Question

If after two hours they are 50 km. apart find the average speel vi Eaun an.
In a class of 60 students, each boy contributed rupees equal to the number of girls and
each girl contributed rupees equal to the number of boys. If the total money then collected
was 1600. How many boys are there in the class?
hose current is running at 3​

Answer 1

Answer:

bro it is understandable please type neatly

Answer 2

Answer:

I HOPE THIS IS HELPFUL

Explanation:

Let the average speed of the second train be x km/h.

Thus, the speed of the first train will be (x+5) km/h.

Distance travelled by the first train in two hours =2(x+5) km/h

Distance travelled by the second train in two hours =2x km/h

Using pythagoras theorem, we have

4x  

2

+4(x+5)  

2

=50  

2

 

4x  

2

+4x  

2

+40x+100=2500

8x  

2

+40x−2400=0

x  

2

+5x−300=0

(x−15)(x+20)=0

x=15,−20

Ignore the negative value of the speed. We have,

Speed of the second train be 15 km/h.

Speed of the first train be (15+5)= 20 km/h.