A car travelled $60 km$ to the north of Patna and then 90km to the south from there. How far from Patna was the car finally?

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30 km

60 km

90 km

120 km

answer is A.

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Detailed Solution

Given that a car travelled 60 km to the north of Patna and then 90km to the south from there.
Taking the north direction as positive and the south direction as negative we have,
= 60 - 90
= -30 km
Since we have taken the south direction as negative, hence the car is finally 30km to the south of Patna.
Hence, option 1 is correct.

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