When two bodies are moving towards each other, their relative speed is equal to the sum of their individual speeds.
'Relative speed' in this case would mean the total distance covered by the two bodies per unit time.
At the time of warning, the boats would have collided in 2 minutes. That means if the distance between them at the time of warning is 'd' miles, then the boats together cover 'd' miles in 2 minutes (or 2/60 = 1/30 hours). Or their relative speed is d/(1/30) = 30d miles per hour.
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'Relative speed' in this case would mean the total distance covered by the two bodies per unit time.
At the time of warning, the boats would have collided in 2 minutes. That means if the distance between them at the time of warning is 'd' miles, then the boats together cover 'd' miles in 2 minutes (or 2/60 = 1/30 hours). Or their relative speed is d/(1/30) = 30d miles per hour.
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