Let the place be ‘x’ km away Upstream speed = speed of boat – speed of current ⇒ upstream speed = 6 - 2 = 4 kmph Downstream speed = speed of boat + speed of current ⇒ downstream speed = 6 + 2 = 8 kmph Total time = time in upstream travel + time in downstream travel But , time = distance/speed ⇒1.5=
x
4
+
x
8
⇒
3x
8
=1.5 ∴ x = 1.5 × 8/3 = 4 km Thus the place is at a distance of 4 km