There are three boats `B_1, B_2` and `B_3` working together they carry 60 people in each trip. One day an early morning carried 50 people in few trips alone. When it stopped carrying the passengers `B_2` and `B_3` started carrying the people together. It took a total of 10 trips to carry 300 people by `B_1, B_2` and `B_3`. It is known that each day on an average 300 people cross the river using only one of the 3 boats `B_1,B_2` and `B_3`. How many trips it would take to `B_1` to carry 150 passengers alone?

Options

A. 15
B. 30
C. 25
D. 10

Answer

A