Question

length of a tunnel, which a train 90

m long, travelling at 48 km/h, can

cross in 21s is

उस सुरंर्ग की लंबाई क्या होर्गी, डजसेएक ९० मीटर की

Answer 1

formula
Distance= speed×time
90+x= 48×5/18 ×21
90+x= 280
x= 190m
xis length of tunnel

Answer 2

Answer:

Length of the tunnel is 190 meter.

Solution:

Let length of the train be x m.

Length of the Train = 90 m

Speed of the train = 48 km/hr = 48 * 5/18 

=> 40/3 m/s

Time = 21 seconds

Distance = Length of tunnel + Length of Train

=> x + 90

Speed * Time = Distance

i.e x + 90 = 40/3 * 21

=> x = 280 - 90

=> x = 190 meter