A man jogging inside a railway tunnel at a constant speed hears An express train approaching the tunnel from behind at a speed of 30 km/h, when he is one third of the way inside the tunnel. Whether he keeps travelling forward or turns back, he will reach the end of the tunnel at the same time the express train reaches that end. The speed at which the man is travelling is:

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A man jogging inside a railway tunnel at a constant speed hears An express train approaching the tunnel from behind at a speed of 30 km/h, when he is one third of the way inside the tunnel. Whether he keeps travelling forward or turns back, he will reach the end of the tunnel at the same time the express train reaches that end. The speed at which the man is travelling is: