**we will assume that the speed of the first will be "x km/hrs" **

**Then according to the question : **

**the speed of the other train = "x+10 km/hrs"**

**We know that "speed = distance ÷ time"**

**→ the speed of the first train : **

**⇒ x = distance/2 (here we are using 2 hours as said in the question) **

** The distance = 2x **

**2x will be the distance covered by the first train **

**For the distance covered by the second train: **

**(we need to only need to add 10 for the distance covered by first train) **

**⇒ 2(x+10) **

**For the length of the tracks : **

**"distance travelled by first train + distance travelled by second train + distance between them"**

**2x+2(x+10)+40 = 300km **

**4x+20+40 = 300km **

**4x = 300km - 60 **

**4x = 240**

**x = 240 ÷ 4 **

**x = 60 km/hrs**

**∴ speed of the first train = 60 km/hrs **

** → for the speed of the second train : **

**⇒ x+10 **

**⇒ 60+10 = 70 km/hrs **

**∴ the speed of the second train = 70 km/hrs **