Ram has to reach office in 2 hours. He travels 2 hours at a speed of 90 kmph to reach office on time. Now, he is already late by 45 minutes. Calculate the speed with which he has to travel, to reach office on time.

145 kmph

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144 kmph

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150 kmph

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151 kmph

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Solution

The correct option is B 144 kmph
As Ram is late by 45 minutes, he has 1 hour and 15 minutes i.e $\frac{75}{60}$ hours 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 × 90 = $\frac{75}{60}$ × s
s = $\frac{10800}{75}$
s = $144$ kmph

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Ram has to reach office in 2 hours. He travels 2 hours at a speed of 90 kmph to reach office on time. Now, he is already late by 45 minutes. Calculate the speed with which he has to travel, to reach office on time.

The correct option is B 144 kmphAs Ram is late by 45 minutes, he has 1 hour and 15 minutes i.e 7560 hours 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 × 90 = 7560 × s s = 1080075 s = 144 kmph