a cyclist travel from his home to school at a distance of 8km in 20 minutes .He then returns to his home in time 25min .find the average speed of the boy
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Answered by
1
Answer:
24. Assertion: A gas exerts pressure on the walls of the container.
Reason: Rate of diffusion of gases is more than that of liquids.
Answered by
1
Answer:
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Answer
Correct option is
B
13
40
Step 1: Time calculation
Forward Journey:
d=6km;v
1
=2.5km/h
Time t
1
=
v
1
d
=
2.5
6
=2.4hr
Backward Journey:
d=6km;v
2
=4km/hr
Time t
2
=
v
2
d
=
4
6
=1.5hr
Step 2: Average speed calculation
We know that, Average speed V
av
=
total time
Total distance
∴ V
av
=
t
1
+t
2
(6+6) km
=
(2.4+1.4)hr
12km
=
13
40
km/hr
Hence average speed for trip is
13
40
km/hr
∴ Option B is correct
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