The speed of the boat in calm water is 30 km/h. A boat takes the same time to travel 10 km upstream as it does to travel 15 km downstream. Find the speed of the river current. than the digit in its units place. Find the speed of river current
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Answer:
6 km/h
Step-by-step explanation:
Let speed of river be r
Speed of boat in upstream= 30-r
Speed of boat in downstream=30+r
Given time to travel 10km upstream = Time to travel 15 km downstream
10/(30-r)=15/(30+r)
=>2/(30-r)=3/(30+r)
=>2*(30+r)=3*(30-r)
=>60+2r=90-3r
=>5r=30
=>r=30/5=6
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