Ram has to reach office in 2 hours. He travels 2 hours at a speed of 80 kmph to reach office on time. Now, he is already late by 1 hour 5 minutes. Calculate the speed with which he has to travel, to reach office on time.

150kmph

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140kmph

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120kmph

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175 kmph

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Solution

The correct option is D
175 kmph

As Ram is late by 1 hour and 5 minutes, he has 55 minutes i.e $\frac{55}{60}$ hour to reach his office.
Also we know that speed is inversely proportional to time (distance remains constant)

So, let's assume speed required to be s

2 × 80 = $\frac{55}{60}$ × s
s = $\frac{9600}{55}$
s = $174.54 \approx 175$ kmph

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