A. 13.33

B. 26.67

C. 39.16

D. 40

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1km = 1000m

Xkm = 300m

X=0.30km

1hr = 3,600s

X = 40.5s

0.01125hr

Therefore; 0.3km/0.1125hr= 26.6666=26.67km/hr

Speed=Distance/Time

Total distance=lenth of the train + length of the tunnel

Total distance=150m+300m=450m

Time=40.5s

Speed( in m/s)= 450/40.5=11.111m/s

Speed(in km/hr)=11.111 x 18/5 = 40 km/hr

Answer: 40 km/hr

D.40

40kmph

13.33 KM/HR

B

40

40

40km/hr

B. 26.67

length of train = 150m

length of tunnel= 300m

total = 450m

time = 40.5seconds

speed = distance/time = 450/40.5 = 11.11m/sec

asked in kmph so we need to convert m/sec tp km/hr

11.11*18/5 = 40km/hr

Distance Traveled = 300 + 150 = 450

Time taken = 40.5 second

in 1 second the train traveled = 450/40.5 = 11.11111

Seconds in 1 hour = 3600

speed of the train = 3600 x 11.111111 = 40000 meter/hour = 40 km/hour

a

Why do you all multiply by

5/18? Is this have any reason behind it?

Why 15/8 ?

Answer:- 1 min = 60 Sec and 1Hrs = 60 Min so when ever we calculate KM/Hrs we need to convert Seconds to Hours so 1hrs=3600 Seconds and 1 Km = 1000 meter so

1000/3600 = 5/18 m/s

1km/hrs = 5/18 m/s

and if we reverse it by cross multiplication

1m/s= 18/5 km/hr

Now about above Question

150 + 300 = 450 meters

40.5 seconds

We need to calculate Speed

Seed = Distance / Time (Basic Formula)

so 450/40.5 = 11.11 m/s to convert m/s to km/s we need to multiply by 18/5

so 11.11*18/5 = 40 km/h

40

S=((150+300)/40.5)×18/5

40

S = D/T

Total distance= length of train + length of tunnel= 450m

S = 450/ 40.5 = 100/9 m/s

Speed in km/hr

100/9 * 18/5 = 40km/hr

speed of train = length of tunnel + length of train / time

speed = 300+150/40.5

speed = 300+150/405 * 10

speed = 11.11m/s

now in km/h 11.11*18/5

speed = 39.99 km/h = 40km/h

Length of Tunnel = 300m

Length of Train = 150m

Therefore, train will cover 450m to come out of tunnel.

Speed = D/T = 450/40.5

Speed in KM/h = Speed(m/s) x 18/5

Therefore Speed(KM/h) = (450 x 18) / (40.5 x 5) = 40KM/h

40

39.16

13.33

ANSWER WILL BE (B) THAT IS 26.67.

SOLUTION :-

300/40.50=7.407 per second metres

for 60 second 7.407*60=444.444 metres

for 60 minutes i.e. 1 hours = 444.444*60=26666.666 metres

now metres will be converted into km than 26666.66/1000=26.67

THIS IS WRONG ANSWER.PLEASE DONOT RAISE ANY QUESTION

RIGHT ANSWER IS – “40”.

SORRY FOR INCONVENIENCE

(300/40.5)x3.6

300m= 0.3km

150 m = 0.15km

Total distance = (0.3+ 0.15) = 0.45

In 40.5s the train crosses 0.45km

In 1s the train crosses (0.45/40.5)km

In 3600s the train crosses (0.45*3600)/40.5 km

= 40 km

Therefore, 40km/hr

300m= 0.3km

150 m = 0.15km

Total distance = (0.3+ 0.15) = 0.45

In 40.5s the train crosses 0.45km

In 1s the train crosses (0.45/40.5)km

In 3600s the train crosses (0.45*3600)/40.5 km

= 40 km

Therefore, 40km/hr

13.33kmph

13.33

cos 3600/40.5=88.88888889

so 800/9 its

150*800/9 m/hr

its 13333.33333 m/hr

so 13.33 km/hr

t=l+x/s

[t=40.5*5/18=11.25]

11.25=450/s

s=450/11.25

s=40km/h

40km/h

option A

S=((150+300)/40.5)×18/5

40

40 kmph

40km/hr

Speed =d/t.

=300/40.5=7.40 m/s.

The speed of the train =7.40X(3600/1000)=26.6 km/hr.

Ans is B.

Distance = 150 + 300 = 450

Time = 40.5 SEC

Speed = (450/40.5) x (18/5) = 40 K/hr

26.67

Total Distance = 150 + 300 => 450

Time = 40.5

Speed of Train = (450/40.5) x (18/5) => 40 K/hr

26.67

40

26.67

26.67

40kmph

40 kmph

13.3

40kmph

40kmph