amit walks 8km east in 2 hours and 3 km in west 1 hour. Find the average speed of amit for the whole journy
i want step by step please
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Amit walks 8km in 1 hour 20 min
or 1\frac{1}{3}=\frac{4}{3}hours1
3
1
=
3
4
hours
Speed= \frac{Disa\tan ce}{Time}
Time
Disatance
=\frac{8}{\frac{4}{3}}=\frac{8\times3}{4}=
3
4
8
=
4
8×3
=6km/h
(a) (i) Distance covered in 10 minutes
=\frac{6\times1000\times10}{60}=1000m\ =\ 1km=
60
6×1000×10
=1000m = 1km
(ii) Distance covered in 30 seconds
=\frac{6\times1000\times30}{60\times60}=50m=
60×60
6×1000×30
=50m
(b) (i) Time taken in 2500m = \frac{2500}{1000\times6}
1000×6
2500
=\frac{5}{12}hours=\frac{5}{12}\times60=25\ \min utes=
12
5
hours=
12
5
×60=25 minutes
(ii) Time taken on 6.5 km
=\frac{6.5}{6}=\frac{65}{60}hours=
6
6.5
=
60
65
hours
= 1 hour 5 minutes
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