At 12:10 o'clock Bill leaves point A towards point B at a speed of 30 Km/h. At 13:40 o'clock Richi leaves from the same point towards point B also, but at a speed of 60 Km/h. At what time will Richi passes over Bill?
Choose the correct choice from the following choices
A) 14:40.	B) 15:10.	C) 16:10	D) 15:40	E) 15:30
Distance travelled by Bill in 1hr 30min ( 12:10 to 13:40) = 30kmph*(90/60)hr = 45km   Relative speed = Richi's speed ~ Bill's speed = 30kmph   Time taken by Richi to cross Bill = 45/30= 
<gadget id="calculator">45/30</gadget>
<output>3/2 = around 1.5</output>
1.5 hrs   Time at which Richi will cross Bill= 13:40 + 1:30 = 14:70 = 15:10 hrs   Ans. 15:10.
<result>B</result>
At 12:10 o'clock Bill leaves point A towards point B at a speed of 30 Km/h. At 13:40 o'clock Richi leaves from the same point towards point B also, but at a speed of 60 Km/h. At what time will Richi passes over Bill?