A boat goes 96 km upstream in 8 hours and covers the same distance moving downstream in 6 hours. On the next day it starts from point A, goes downstream for 1 hour, then upstream for 1 hour, and…
Question and options
A boat goes 96 km upstream in 8 hours and covers the same distance moving downstream in 6 hours. On the next day it starts from point A, goes downstream for 1 hour, then upstream for 1 hour, and repeats this for four more times, that is, 5 upstream and 5 downstream journeys. Then the boat would be
- 22.5 km downstream of A
- 20 km downstream of A
- 15 km downstream of A
- 12.5 km downstream of A
Answer and explanation
Correct answer: B - 20 km downstream of A
Upstream speed 96/8=12 km/h, downstream 96/6=16 km/h. Each down+up pair nets 16-12=4 km downstream; 5 pairs give 20 km downstream of A.
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