Question

ritu can row downstream 20km in 2 hours and upstrem 4 km in 2 hours find her speed of rowing in still water and the speed of the current​

Answer 1

s=d/t

Step-by-step explanation:

20km /2hours =10km/hr downstream =4km/hr

Answer 2

Step-by-step explanation:

let speed of boat in still water be x km/hr

and speed of the current be y km/hr

for downstream

distance = 20 km

time = 2 hr

speed = x + y

we know

speed = distance÷time

$= > x + y = \frac{20}{2} \\ \\ = > x + y = 10.............(1)$

for upstream

distance = 4 km

time = 2 hrs

speed = x - y

$= > x - y = \frac{4}{2} \\ \\ = > x - y = 2............(2)$

on solving eq.1 and eq. 2 we get

$x + y = 10 \\ x - y = 2 \\ .................\\ = > 2y = 8 \\ = > y = 4 \\ \\ from \: eq(2) \\ = > x = 2 + y \\ \\ = > x = 2 + 4 \\ \\ = > x = 6$

therefore therefore speed of the boat in Stillwater is 6 km/hr and speed of the current is 4 km/hr