8. Find the speed of walking

Sarthak takes \(3\) hours more than Nishi to walk \(30 \ km\). But if Sarthak doubles his speed, he is ahead of Nishi by \(1 \frac{1}{2}\) hours. Determine their speed of walking.

 

 

Nishi’s speed is  \(\ km/h\)

 

Sarthak’s speed is $\frac{i}{i}$ \(\ km/h\)