77. A car travels from the origin along the positive x-axis for 30 minutes with a speed of 60 kilo-meters/hour (kmph), and then for the next 20 minutes along the positive y-axis with a speed of 120 kmph. What is the magnitude of the average velocity for this journey (in kmph)?
A) 50.4
[B] 70
[C] 84
D) 60
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Answered by
0
Answer:
Correct option is
C
48 kmh
−1
Total distance covered by car = 60 km
And, total time taken in journey t=t
1
+t
2
t=
v
1
s
1
+
v
2
s
2
=
60
30
+
40
30
=
4
5
h
Therefore, Average Speed=
Total Time
Total Distance
=
4
5
h
60km
=48 km/h
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