From the table, answer the following questions.
The average speed(in km/hour) among $5.00$ hrs, $7.00$ hrs and $9.00$ hrs is ___________.
Time(in hrs) $5$ $7$ $9$ $11$ $13$ $17$ $15$ $19$ $21$
Speed(in km/hour) $40$ $50$ $60$ $80$ $70$ $65$ $75$ $60$ $50$

50

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55

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60

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65

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Solution

The correct option is A $50$
At 5.00 hrs speed is $= 40 k m / h r$
At 7.00 hrs speed is $= 50 k m / h r$
At 9.00 hrs speed is $= 60 k m / h r$

$∴$ Average speed $= \frac{40 + 50 + 60}{3} = \frac{150}{3} = 50 k m / h r$

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Similar questions

9.00

11.00

Time(in hrs.)	$5$	$7$	$9$	$11$	$13$	$17$	$15$	$19$	$21$
Speed (in km/hour)	$40$	$50$	$60$	$70$	$65$	$75$	$60$	$50$

19.00

21.00

Time(in hrs)	$5$	$7$	$9$	$11$	$13$	$17$	$15$	$19$	$21$
Speed (in km/hour)	$40$	$50$	$60$	$80$	$70$	$65$	$75$	$60$	$50$

Ajay drove for 3 hours at a rate of 50 km per hour and for 2 hours at 60 km per hour. What was his average speed for the whole journey?

1

40

75

2

50

60

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