A Train has a Speed of 60KM/H for the First One Hour and 40 km/h For the Next Half Hour

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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/hr

Distance covered by the train, d₁ =v₁t₁

                     d₁ = 60×1 km

For 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=1.5hr

Average speed, v(avg) = d/t

v(avg) = 80km/1.5hr

=53.33km/h

Answer = 53.33km/h


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