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A Train has a Speed of 60KM/H for the First One Hour and 40 km/h For the Next Half Hour
A. 40km/h
B. 48km/h
C. 53.33km/h
D. None of these
Answer – (C) 53.33km/h
Explain:-
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Given:
Speed = 60km/h
First four = 40km/h
Solve:
train has a speed of 60km/h for the first one hour,
t₁ =1hr, v₁=60km/hrDistance covered by the train, d₁ =v₁t₁
d₁ = 60×1 kmFor the next half hour, train has speed 40km/hr
v₂ =40km/hr, t₂ =0.5hr
d₂ = v₂t₂
d₂ =40×0.5=20km
Total distance, d= d₁ + d₂
d=60+20=80km
Total time, t = t₁ + t₂
t=1hr+0.5hr=1.5hrAverage speed, v(avg) = d/t
v(avg) = 80km/1.5hr
=53.33km/h
Answer = 53.33km/h
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