Question

Two boat a and b start towards each other from place .108km apart. Speed of boat in still water a anb b 12 and 15 respectively . If proceesds down and b up the stream.They will meet after?

Answer 1

108=(12t+15t)
108=27t
108/27=t
4[time unit of your choice]

pls mark brainliest

Answer 2

Answer:

4

Step-by-step explanation:

Let the speed of stream = y km/h  

Since Boat A is moving downstream with 12 km/h  

Speed of boat A  

= (12+y)(12+y)km/h  

Since Boat is moving upstream with 15km/h

Speed of boat B  

= (15−y)(15−y) km/h  

Both the boats are moving in opposite direction

Relative speed of A and B  

=12+y+15−y12+y+15−y

=27 km/h

Time=DistanceRelative Speed=10827=4DistanceRelative Speed=10827=4 hours