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- Check units.
- Convert if needed.
- Apply S = D/T, D = S x T, or T = D/S.
Correct Answer: A
Correct Answer: A
Method / Topic: Time Speed Distance
The answer uses consistent units in the speed-distance-time relation.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: Time Speed Distance
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<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px">For equal distances, do not take simple average of speeds. Total distance = 180+180 = 360 km. Time going = 180/60 = 3 hours. Time returning = 180/90 = 2 hours. Total time = 5 hours. Average speed = total distance/total time = 360/5 = 72 km/h.</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 car travels 180 km at 60 km/h and returns at 90 km/h. What is the average speed for the whole journey?
Explanation
Correct Answer: A
Method / Topic: Time Speed Distance
The answer uses consistent units in the speed-distance-time relation.
Short Explanation
Detailed Explanation
Correct Answer: A
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:top; white-space:normal; width:85px">For equal distances, do not take simple average of speeds. Total distance = 180+180 = 360 km. Time going = 180/60 = 3 hours. Time returning = 180/90 = 2 hours. Total time = 5 hours. Average speed = total distance/total time = 360/5 = 72 km/h.</td>
</tr>
</tbody>
</table>
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