Question

Two locomotives approach each other on the parallel tracks. Each has speed of $95km/h$ with respect to the ground. If they are initially $8.5km$ apart, how long will it be before they reach each other? (in hours)

• A. $0.045$
  
• B. $0.065$
  
• C. $0.025$
  
• D. $0.078$
  

Answer 1

The correct option is A $0.045$

The locomotives approaching each other with the same speed of $95㎞/h$

Then the relative speed of the locomotives

$v_{relative}=95+95=190㎞/h$

Initial distance between the locomotives is $8.5㎞$

$\therefore time=\frac{distance}{v_{relative}}$

$=\frac{8.5}{190}=0.045h$