Question:
A boat goes upstream 30 km and downstream 55 km in 10 hours. It goes upstream 40 km and downstream 55 km in 13 hour. Find out the speed of stream and the boat.

Option A):
Speed of boat 5, speed of stream is 3
Option B):
Speed of boat 8, speed of stream is 3
Option C):
Speed of boat 3, speed of stream is 5
Option D):
Speed of boat 3, speed of stream is 8

Correct Answer is Option B):
Speed of boat 8, speed of stream is 3