Question
A train covers a certain distance in 210 minutes at a speed of 60 kmph. The time taken by the train, to cover the same distance at a speed of 80 kmph is :
Answer: Option B
Answer: (b)Speed of train = 60 kmphTime = 210 minutes= $210/60$ hours or $7/2$ hoursDistance covered= $60 × 7/2$ = 210 kmTime taken at 80 kmph= $210/80 = 21/8$ hours= 2$5/8$ hoursUsing Rule 9,Here, $S_1 = 60, t_1 = 210/60 hrs, S_2 = 80, t_2$ = ?$S_1t_1 = S_2t_2$60 × $210/60 = 80 × t_2$$t_2 = 21/8$ hrs = 2$5/8$ hrs
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Answer: (b)Speed of train = 60 kmphTime = 210 minutes= $210/60$ hours or $7/2$ hoursDistance covered= $60 × 7/2$ = 210 kmTime taken at 80 kmph= $210/80 = 21/8$ hours= 2$5/8$ hoursUsing Rule 9,Here, $S_1 = 60, t_1 = 210/60 hrs, S_2 = 80, t_2$ = ?$S_1t_1 = S_2t_2$60 × $210/60 = 80 × t_2$$t_2 = 21/8$ hrs = 2$5/8$ hrs
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