A 180 metres long train crosses a man walking the same direction at a speed of 7.2 km per hour in 10 seconds. What is the speed of the train ?
1)66 km/hour
2)72 km/hour
3)78 km/hour
4)84 km/hour
5)90 km/hour
Answers
Answered by
1
let man at rest.
absolute velocity of train is v.
then relative velocity of train wrt. man is v-2 m/s
time = distance /velocity
10= 180/(v-2)
2) 72km/hour
absolute velocity of train is v.
then relative velocity of train wrt. man is v-2 m/s
time = distance /velocity
10= 180/(v-2)
2) 72km/hour
Answered by
0
Answer:
Step-by-step explanation:
180/10*18/5= 324/5
x - 7.2 = 324/5
5x - 36 = 324
X = 324+36/5 = 72 kphr
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