Bruno and Sacha are running in the same direction around a stadium. Sacha runs at a constant speed of 7 meters per second, and Bruno runs at a constant speed of 5 meters per second. At a certain point Sacha overtakes Bruno. If one minute afterward, Sacha stops and waits for Bruno to reach him, then how many seconds does he have to wait?
Pick one.
A) 12  B) 24  C) 36  D) 60  E) 72
the difference of the speed is 2m per second so in one minute Sacha will be 120 m ahead of Bruno..   Bruno will cover this in  120/5= 
<gadget id="calculator"> 120/5</gadget>
<output>24</output>
24 secs..   24
<result>B</result>
Bruno and Sacha are running in the same direction around a stadium. Sacha runs at a constant speed of 7 meters per second, and Bruno runs at a constant speed of 5 meters per second. At a certain point Sacha overtakes Bruno. If one minute afterward, Sacha stops and waits for Bruno to reach him, then how many seconds does he have to wait?