Answer: C) Cadbury Explanation:

Answer: A) 15 Explanation: Combined efficiency of all the three boats = 60 passenger/trip    Now, consider option(a)   15 trips and 150 passengers means efficiency  of B1 =  10 passenger/trip    which means in carrying 50 passengers B1 must has taken 5 trips. So the rest trips equal to 5 (10-5 = 5) in which B2 and B3 together carried remaining 250 (300 - 50 = 250) Passengers.   Therefore the efficiency of B2 and B3 = 250/5 = 50 passenger/trip     Since, the combined efficiency of B1, B2 and B3 is 60. Which is same as given in the first statement hence option(a) is correct.

Answer: B) 20 minutes Explanation: First send 17 and 7. After 7 minutes, 7 is at finish and 17 needs 10 more minutes to complete his travel. now send 13. After 10 minutes 17 reaches finish and 13 needs 3 more minutes to complete. now send 3. both 3 and 13 reach destination at the same time after 3 minutes. hence the time taken is 7+10+3=20 minutes.