I need to know question 9
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antar1:
The answer is 143 km but I don’t know how
142.8 (approximately)
Can you please help me with my problem
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Train moving with a uniform velocity
That is 70 km/h. So,
70 km =1hour
Thereby, 100km=100÷70= 1.428hours
Bird have a velocity 100km/h
100km=1hour..... (1)
Train have to make up a journey of more 1.428hours
So bird also have equal time as that of the train.
So from(1), we have
1.428hour =1.428×100km=142.8 km
So bird has fly 142.8 km by the time when train reaches the station.
That is 70 km/h. So,
70 km =1hour
Thereby, 100km=100÷70= 1.428hours
Bird have a velocity 100km/h
100km=1hour..... (1)
Train have to make up a journey of more 1.428hours
So bird also have equal time as that of the train.
So from(1), we have
1.428hour =1.428×100km=142.8 km
So bird has fly 142.8 km by the time when train reaches the station.
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