Question

answer me guysssssss​

Answer 1

Answer:

17 mins 30 secs

Step-by-step explanation:

Depth of the tunnel below sea level=50m

level of the Tunnel above sea level=20m

Total depth=50+20=70m

Depth covered in a min=4m

therefore total time taken=70/4=17.5 or 17 mins 30 secs

Hope this helps.....