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If the reading on the odometer of a vehicle at the beginning of a trip and after $40$ minutes were $1048 km$ and $1096 km$ , respectively, then its average speed would be__

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72 km / h

85 km / h

80 km / h

None of the above

answer is A.

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Detailed Solution

The average speed is

72 km / h

.
Given;

Final distance = 1096

Initial distance = 1048

Time 40 \min = 40 / 60 hr

= 2 / 3 hr

Average speed (v) = \frac{1096 - 1048}{2 / 3}

\Rightarrow

v = 72 km / h

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