state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Speed Time and Distance Boat and River

A boat goes upstream at speed of 10 km/hr. It goes downstream at a speed of 30 km/hr. how much time will the boat take to cover a distance of 30 km in still water?

1
2 hours
2
1 hour
3
3 hours
4
90 minutes
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