A driver of an army truck sees an ambulance 80 meters ahead of him. After 10 seconds the ambulance is 70 m behind. If the speed of the truck is 104kmph, then what is the speed of the ambulance?
Relative speed = (Total Distance)/(Total Time) = (70 + 80)/10 = 15 m/sec Speed in km/hr = 15 x 18/5 = 54 km/hr Relative speed = speed of truck – speed of ambulance 54 = 104 – speed of ambulance Speed of ambulance = 104 – 54 = 50km/hr
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One acre is equivalent to
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(a) Fe2+
(b) Fe4+
(c) Fe
(d) Fe3+
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