Choose the correct answer from the alternatives given.
If a train runs at 70 km/hr, it reaches its destination late by 12 minutes. But if it runs at 80 km/hr. it is late by 3 minutes. The correct lime to cover the journey is

58 minutes

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2 hours

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1 hour

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59 minutes

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Solution

The correct option is C 1 hour
Letthe correct time to cover journey be t.
As distance is constant,
$\frac{s_{1}}{s_{2}} = \frac{t_{2}}{t_{1}} \Rightarrow \frac{70}{80} = \frac{t + 3}{t + 12}$
7t +84 = 8t + 24
t =60 minutes or / hour
Hence,correct time for journey is 1 hour.

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Choose the correct answer from the alternatives given.If a train runs at 70 km/hr, it reaches its destination late by 12 minutes. But if it runs at 80 km/hr. it is late by 3 minutes. The correct lime to cover the journey is

The correct option is C 1 hourLetthe correct time to cover journey be t.As distance is constant, s1s2=t2t1⇒7080=t+3t+12 7t +84 = 8t + 24t =60 minutes or / hourHence,correct time for journey is 1 hour.

Choose the correct answer from the alternatives given.
If a train runs at 70 km/hr, it reaches its destination late by 12 minutes. But if it runs at 80 km/hr. it is late by 3 minutes. The correct lime to cover the journey is

The correct option is C 1 hour
Letthe correct time to cover journey be t.
As distance is constant,
$\frac{s_{1}}{s_{2}} = \frac{t_{2}}{t_{1}} \Rightarrow \frac{70}{80} = \frac{t + 3}{t + 12}$
7t +84 = 8t + 24
t =60 minutes or / hour
Hence,correct time for journey is 1 hour.