Question
A train moves with a speed of 30 kmph for 12 minutes and for next 8 minutes at a speed of 45 kmph. Find the average speed of the train:
Answer: Option D
Answer: (d)Using Rule 3,Average speed= $\text"Total distance"/\text"time taken"$= ${30 × 12/60 + 45 × 8/60}/{12/60 + 8/60}$= 12 × 3 = 36 kmph
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Answer: (d)Using Rule 3,Average speed= $\text"Total distance"/\text"time taken"$= ${30 × 12/60 + 45 × 8/60}/{12/60 + 8/60}$= 12 × 3 = 36 kmph
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