Question

a stream flowing at a speed of 3 km per hour a Boat with a speed of 9 km per hour is taken downstream in 3×1÷2hours​

Answer 1

Let distance be x km

Speed downstream = 5+2 = 7 km /hr.

Speed upstream = 5-2 = 3 km/hr.

So x/3−x/7=2

7x−3x=2×21

4x = 42

x=42/4=10.5 km/h