A 12. 0 g sample of a metal is heated to 90. 0 ◦c. It is then dropped into 25. 0 g of water. The temperature of the water rises from 22. 5 to 25. 0 ◦c. The specific heat of water is 4. 18 jg−1◦c−1. Calculated the specific heat of the metal. Express your answer in jg−1◦c−1.

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17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?