A train travels 20 km a uniform speed of 60 km b. and the next 20 kom at a uniform speed of 80 km
Culate its average speed
[Ans. 68-54 lan -
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Answer:
Average Speed = Total distance / Total time.
T1 to cover 20 Km = 20/60 = 1/3 hour.
T2 to cover next 20 = 20/80 = 1/4 hour
t1 + t2 = 1/3+1/4= 7/12 hour.
s1+ s2. = 20+20 = 40 Km
Average speed = 40 / 7/12
= 40×12/7
= 480/7
= 68.57 Kmph
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