SOLUTION: Respected Sir, My question is : The ratio between the speeds of two trains is 7:8 .If the second train runs 400 km in 5 hours,the speed of the first train is ? Thank you i

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Question 708178: Respected Sir,
My question is :
The ratio between the speeds of two trains is 7:8 .If the second train runs 400 km in 5 hours,the speed of the first train is ?

Thank you in advance
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
The second train's speed is 400km/5hours = 80 km/h
x= speed of first train in km/h
x%2F80=7%2F8 --> x=80%287%2F8%29 --> x=80%2A7%2F8 --> highlight%28x=70%29
The speed of the first train is 70 kilometers per hour.