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- Check units.
- Convert if needed.
- Apply S = D/T, D = S x T, or T = D/S.
Correct Answer: C
Correct Answer: C
Method / Topic: Time Speed Distance
The answer uses consistent units in the speed-distance-time relation.
Short Explanation
Detailed Explanation
Correct Answer: C
Method / Topic: Time Speed Distance
<table cellspacing="0" style="border-collapse:collapse; width:85px">
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<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:bottom; white-space:normal; width:85px">Average speed for the whole journey is total distance divided by total time. Total distance = 180 + 120 = 300 km. Total time = 3 + 2 = 5 hours. Average speed = 300/5 = 60 km/h. Do not take the average of separate speeds unless time or distance conditions allow it.</td>
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Check units.
- Convert if needed.
- Apply S = D/T, D = S x T, or T = D/S.
A person travels 180 km in 3 hours and then 120 km in 2 hours. What is his average speed for the whole journey?
Explanation
Correct Answer: C
Method / Topic: Time Speed Distance
The answer uses consistent units in the speed-distance-time relation.
Short Explanation
Detailed Explanation
Correct Answer: C
Method / Topic: Time Speed Distance
<table cellspacing="0" style="border-collapse:collapse; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:bottom; white-space:normal; width:85px">Average speed for the whole journey is total distance divided by total time. Total distance = 180 + 120 = 300 km. Total time = 3 + 2 = 5 hours. Average speed = 300/5 = 60 km/h. Do not take the average of separate speeds unless time or distance conditions allow it.</td>
</tr>
</tbody>
</table>
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