Kiran goes to the office at the speed of 3 km/hr and reaches 7 minutes late. If she travels at the speed of 4 km/hr, then she will reach the office 8 minutes earlier than the actual time. What is the distance to her office?

3 km

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4 km

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5 km

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12 km

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Solution

The correct option is A 3 km
The difference in the time = T_slow – T_fast = 7 – (– 8) = 15 mins

Let the distance to her office be ‘D’ km.

According to the question,

$\frac{D}{3} - \frac{D}{4} = \frac{15}{60}$

$\Rightarrow \frac{D}{12} = \frac{1}{4}$

⇒ D = 3 km

Hence, option A is the correct answer.

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Kiran goes to the office at the speed of 3 km/hr and reaches 7 minutes late. If she travels at the speed of 4 km/hr, then she will reach the office 8 minutes earlier than the actual time. What is the distance to her office?

The correct option is A 3 kmThe difference in the time = Tslow – Tfast = 7 – (– 8) = 15 mins Let the distance to her office be ‘D’ km. According to the question, D3−D4=1560 ⇒D12=14 ⇒ D = 3 km Hence, option A is the correct answer.