Question

A toy train crosses 210 m and 122 m long tunnels in 25 and 17 seconds respectively . Find the length of the train??

Answer 1

The length of the train is 30 m.

Answer 2

Answer:

The length of the train is 65 m

Step-by-step explanation:

Given:

Toy train cross the tunnel =210 m

Time taken =25 sec

Step 1:

Speed = distance / time = 210/ 25 m/s

Same in 2nd case  

Step 2:

Speed = distance /time  

Speed = 22/17 m/s

Now we remember here distance is combination of train length and tunnel length  

Step 3:

(Train length +210)/25=speed

So(x+210) /25 = (x+122) /17

17(x+210) = 25(x+122)

17x+3570 = 25x+3050

8x = 520

X = 65

Step 4:

Length of train = 65 m

Now  

Speed = (65 + 210) / 25 = 275/25 = 11m/s