please ans sample problem 4..with explainatation
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Average speed = Total distance / Time
60 = 120 / (t1 + t2)
t1 + t2 = 2
30/30 + 90/v = 2 ……[∵ Time = Distance/Speed]
1 + 90/v = 2
90/v = 1
v = 90 kmph
Train should travel at 90 kpmh for next 90 km
60 = 120 / (t1 + t2)
t1 + t2 = 2
30/30 + 90/v = 2 ……[∵ Time = Distance/Speed]
1 + 90/v = 2
90/v = 1
v = 90 kmph
Train should travel at 90 kpmh for next 90 km
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