Multiple choice

A boat goes 40 km upstream in 8 hr and a distance of 49 km downstream in 7 hr. find the speed of boat in still water?

  1. 5km/hr

  2. 6km/hr

  3. 5.5km/hr

  4. 6.5km/hr

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Upstream speed = 40/8 = 5 km/hr (boat - stream). Downstream speed = 49/7 = 7 km/hr (boat + stream). Adding both: (boat + stream) + (boat - stream) = 7 + 5 = 12, so 2 × boat = 12. Boat speed in still water = 6 km/hr.

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