Question

A car travels 84 km / hr for 1 hour, 72 km / hr for 3/4 hour and 26 km / hr for 15 minutes . Find its average speed for the whole journey ?

2) The distance around a circle is called __________.

3) The mid - point of a circle is ____________.

4) Two or more circle with the same centre are called ____________.
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Answer 1

hope

When an iron nail dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes. The reaction is:

Fe + CuSO4 → FeSO4 + Cu