![A boat goes 24 km upstream and 36 km downstream total time taken is 6 hours. If the boat goes 36 km upstream and 24 km](https://www.gkseries.com/blog/wp-content/uploads/2024/04/A-boat-goes-24-km-upstream-and-36-km-downstream-total-time-taken-is-6-hours.-If-the-boat-goes-36-km-upstream-and-24-km.jpg)
A boat goes 24 km upstream and 36 km downstream total time taken is 6 hours. If the boat goes 36 km upstream and 24 km downstream then the time taken is 6 1/2 hours. Find the speed of boat in still water?
(a) 9 km/hr
(b) 8 km/hr
(c) 12 km/hr
(d) 10 km/hr
Sol:
![](https://www.gkseries.com/blog/wp-content/uploads/2024/04/image-62-1024x742.png)
Subtracting both we get 60 km downstream at 5 hours
Speed of downstream = 12 km/hr
From 1 ⇒ for 36 km downstream = 3 hour
24 km upstream in 3 hours
Upstream = 8 km/hr
Speed of boat = 10 km/h