P, Q, R, S, T and U are six cities which are in a row in the same order. A bus, b1 travels from P to U and another bus b2 travel from U to P. The bus b1 reaches S at 10:40 and bus b2 reaches Q at 10:35 if the travel time between any two adjacent cities is 40 minutes and the stoppage time at each city is 15 minutes, then at what time do they start at their respective destinations? Pick:  A) 8:00, 7:00  B) 8:00, 7:10  C) 8:10, 7:10  D) 8:15, 7:25  E) 8:10, 7:00
Explanation:   The bus b1, which started at P, reached S at 10:40, passing through the intermediary cities Q and R.   The time taken to travel from P to S   = 3 * 40 + 2 * 15= 
<gadget id="calculator">3 * 40 + 2 * 15</gadget>
<output>150</output>
150minute   (journey)+(stoppage)= 2 hrs 30 minutes.   Hence, b1 started at 10:40 - 2:30 = 8:10 at P.   b2 reached Q, starting at U, through the city T, S and R.   The time taken by it to reach S = 4 * 40 + 3 * 15= 
<gadget id="calculator">4 * 40 + 3 * 15</gadget>
<output>205</output>
205 minutes= 3 hr 25 minutes.   Hence, b2 started at, 10:35 - 3:25 = 7:10, at U.   ANSWER IS 8:10, 7:10
<result>C</result>
P, Q, R, S, T and U are six cities which are in a row in the same order. A bus, b1 travels from P to U and another bus b2 travel from U to P. The bus b1 reaches S at 10:40 and bus b2 reaches Q at 10:35 if the travel time between any two adjacent cities is 40 minutes and the stoppage time at each city is 15 minutes, then at what time do they start at their respective destinations?