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Algebra
Pregunta

3. An express train travels \( 100 kph \) from sta...

3. An express train travels \( 100 kph \) from station A to station B. A local train travelling at \( 45 kph \) , takes \( 45 \) minutes longer for the same trip. How far apart is station A from station B. 

Answer

Let "d" be this distance.

The "time equation" is    d%2F45 - d%2F100 = 3%2F4  of an hour  (= 45 minutes).

To solve it, multiply both sides by 900.  

You will get    20d - 9d = 675      

11d    = 675

 

 

d    = 675%2F11 = 61.364.

 

 

 

CHECK.   61.364%2F45+-+61.364%2F100 = 0.75 = 3%2F4  of an hour

Solución
View full explanation on CameraMath App.