Question

this question can be solved using simultaneous linear equation but how?

Answer 1

let the speed = x 

distance = 7x 

now when speed = x +10 

time taken = 6h 

distance = (x+10 ) 6 

now 7x = ( x + 10 ) 6 

7x = 6x + 60 

x = 60 km /h 

distance = 60 m /h x 7 

distance = 420 km 

Answer 2

The answer is provided through the attachment.