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

The length of tunnel is 190 m

Step-by-step explanation:

Let the length of tunnel be x

Length of train = 90 m

Total distance = 90+x

Speed of train =$48 km/hr = 48 \times \frac{5}{18}=\frac{40}{3} m/s$

Time = 21 s

$Time = \frac{Distance}{Speed}$

$21 = \frac{90+x}{\frac{40}{3}}$

$21 \times 40 =3(90+x)$

$840=270+3x$

$570=3x$

$\frac{570}{3}=x$

190=x

Hence the length of tunnel is 190 m

#Learn more:

A train 77m long is running at 60 km/hr if it takes 30 seconds to cross the tunnel then find the length of the tunnel

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