Nada cyclone!

Algebra Level 3

Consider that the nada cyclone started with the speed of about 100 km/hr. It continued with the same speed for 3 hours and after that its speed was decreasing constantly at the rate of 10 km/hr.If the cyclone reaches the shore at 11th hour of formation, What will its speed be then.

20 km/hr 10 km/hr 30 km/hr 40 km/hr

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