gary drove from point a to point b at 60 km / h. on his way back he took a train travelling at 110 km / h and therefore his trip back lasted 5 hours less. what is the distance ( in km ) between a and b?
Choose the correct choice.
A) 600 . B) 630 . C) 660 . D) 690 . E) 720 .
<gadget id="calculator">110 * 5</gadget>
<output>550</output>

<gadget id="calculator">110 - 60</gadget>
<output>50</output>

<gadget id="calculator">550 / 50</gadget>
<output>11</output>

<gadget id="calculator">60 * 11</gadget>
<output>660</output>

<result>C</result>
gary drove from point a to point b at 60 km / h. on his way back he took a train travelling at 110 km / h and therefore his trip back lasted 5 hours less. what is the distance ( in km ) between a and b?
multiply(60, divide(multiply(110, 5), subtract(110, 60)))
distance = speed * time d 1 = s 1 t 1 d 2 = s 2 t 2 the distance from point a to point b is the same for each trip so , d 1 = d 2 and t 2 = t 1 - 5 thus , s 1 t 1 = s 2 t 2 60 t 1 = s 2 ( t 1 - 5 ) t 1 = 11 60 * 11 = 660 answer : c