Given :
Distance covered by object , D = 63 cm .
Time taken to cover distance D , t = 2 days .
To Find :
The speed of object in m/s .
Solution :
First we will convert all units into m and hours .
D = 63 cm = 0.63 m .
.
Now , speed is :

Hence , this is the required solution .
Answer:
a = 21 or -21
Step-by-step explanation:
Either a/7 = 3 meaning a = 21
<u> OR </u> a/7 = -3 meaning a = -21