Question
A train covers a distance of 10 km in 12 minutes. If its speed is decreased by 5 km/hr, the time taken by it to cover the same distance will be :
Answer: Option B
Answer: (b)Using Rule 1,Speed of train = $\text"Distance"/ \text"Time"$= $10/{12/60}$ kmph = ${10 × 60}/12 = 50$ kmphNew speed = 45 kmphRequired time = $10/45$ hour= $2/9 × 60$ minutes = $40/3$ minutes= 13 minutes 20 seconds
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Answer: (b)Using Rule 1,Speed of train = $\text"Distance"/ \text"Time"$= $10/{12/60}$ kmph = ${10 × 60}/12 = 50$ kmphNew speed = 45 kmphRequired time = $10/45$ hour= $2/9 × 60$ minutes = $40/3$ minutes= 13 minutes 20 seconds
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