ExamPrepWay
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Solve this faster with the right shortcut first
- 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
<table cellspacing="0" style="border-collapse:collapse; height:20px; width:85px">
<tbody>
<tr>
<td style="background-color:#c0e6f5; border-bottom:1px solid #44b3e1; border-left:none; border-right:none; border-top:1px solid #44b3e1; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Convert 20 minutes into hours: 20/60=1/3 hour. Total time=2+1/3=7/3 hours. Average speed=distance/time=42÷(7/3)=42×3/7=18 km/h. A
is to treat 20 minutes as 0.20 hour, which is incorrect because time uses sixty minutes per hour. Always convert minutes by dividing by 60 before applying the speed
.</span></td>
</tr>
</tbody>
</table>
See full explanation + shortcut trick
Compare the quick idea with the premium step-by-step explanation and faster solving trick for this pattern.
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 cyclist covers 42 km in 2 hours 20 minutes. Find the average speed.
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; height:20px; width:85px">
<tbody>
<tr>
<td style="background-color:#c0e6f5; border-bottom:1px solid #44b3e1; border-left:none; border-right:none; border-top:1px solid #44b3e1; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Convert 20 minutes into hours: 20/60=1/3 hour. Total time=2+1/3=7/3 hours. Average speed=distance/time=42÷(7/3)=42×3/7=18 km/h. A
is to treat 20 minutes as 0.20 hour, which is incorrect because time uses sixty minutes per hour. Always convert minutes by dividing by 60 before applying the speed
.</span></td>
</tr>
</tbody>
</table>
See full explanation + shortcut trick
Use the free answer check first, then unlock the complete breakdown, shortcut path, and richer explanations for similar questions.
Keep Practicing This Pattern
Recommended Next Practice
Use these suggestions after solving the practice questions above.