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A train moving with speed of …

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A train moving with speed of 30km/h in first 15min.with another speed of 40km/h the next 15min.then with a speed of 60km/h in last 30 min. Calculate average speed of train for this journey.

Posted by Anoop Lal 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Ranjeet Kumar 6 years, 6 months ago

Distance covered in first interval , x_1 = 30 × 5/18 × 15 × 60 m = 7500 m In second interval , x_2 = 40 × 5/18 × 15 × 60 m = 10000 m In third interval , x_3 = 60 × 5/18 × 30 × 60 m = 30000 m Total time = t_1+ t_2 + t_3 = 15×60 +15×60 +30×60s = 900 + 900 + 1800s = 3600 s = 1h Average speed = (x_1+ x_2 + x_3)/( t_1+t_2+t_3) = (47500/3600) ms^-1 = 47.5 km/ h

Pawan Kumar Jha 6 years, 6 months ago

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