At 9 am a car (A) began a journey from a point, traveling at 40 mph. At 10 am another car (B) started traveling from the same point at 60 mph in the same direction as car (A).
At what time will car B pass car A?  Choose the correct choice from the following answers.
A) 12 pm B) 1 pm C) 2 pm D) 3 pm E) 4 pm
After t hours the distances D1 traveled by car A is given by   D1 = 40 t   Car B starts at 10 am and will therefore have spent one hour less than car A when it passes it. 12 pmfter (t - 1) hours, distance D2 traveled by car B is given by   D2 = 60 (t-1)   When car B passes car 12 pm, they are at the same distance from the starting point and therefore D1 = D2 which gives   40 t = 60 (t-1)   Solve the above equation for t to find   t = 3 hours   Car B passes car 12 pm at   9 + 3= 
<gadget id="calculator">9 + 3</gadget>
<output>12</output>
12 pm   12 pmnswer 12 pm
<result>A</result>
At 9 am a car (A) began a journey from a point, traveling at 40 mph. At 10 am another car (B) started traveling from the same point at 60 mph in the same direction as car (A).
At what time will car B pass car A?