Solve this question-4- nbsp- A vehicle travels half the distance L with speed nbsp-V1 and the other half with speed V2- then speed is-a- V1-V22-b- 2V1-V2V1-V2-c- 2V1V2V1-V2-d- LV1-V2V1V2

Dear Student, Total #160;time #160;taken #160;to #160;cover #160;first #160;half #160;of #160;the #160;distance=L2V1=L2V1Similarly, #160;ti ...

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Standard VII

Mathematics

Comparing Quantities : Introduction

Solve this qu...

Question

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4. A vehicle travels half the distance L with speed $V_{1}$ and the other half with speed $V_{2}$ , then speed is
(a) $\frac{V_{1} + V_{2}}{2}$
(b) $\frac{2 V_{1} + V_{2}}{V_{1} + V_{2}}$
(c) $\frac{2 V_{1} V_{2}}{V_{1} + V_{2}}$
(d) $\frac{L (V_{1} + V_{2})}{V_{1} V_{2}}$

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Solution

Dear Student,

$Total time taken to cover first half of the distance = \frac{\frac{L}{2}}{V_{1}} = \frac{L}{2 V_{1}} Similarly, time taken to cover the second half = \frac{\frac{L}{2}}{V_{2}} = \frac{L}{2 V_{2}} Average speed = \frac{total distance}{total time taken} Average speed = \frac{L}{\frac{L}{2 V_{1}} + \frac{L}{2 V_{2}}} = \frac{2 V_{1} V_{2}}{V_{1} + V_{2}}$

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Solve this question 4. A vehicle travels half the distance L with speed V1 and the other half with speed V2, then speed is (a) V1+V22 (b) 2V1+V2V1+V2 (c) 2V1V2V1+V2 (d) LV1+V2V1V2

Dear Student, Total time taken to cover first half of the distance=L2V1=L2V1Similarly, time taken to cover the second half=L2V2=L2V2Average speed=total distancetotal time takenAverage speed=LL2V1+L2V2=2V1V2V1+V2

Solve this question
4. A vehicle travels half the distance L with speed $V_{1}$ and the other half with speed $V_{2}$ , then speed is
(a) $\frac{V_{1} + V_{2}}{2}$
(b) $\frac{2 V_{1} + V_{2}}{V_{1} + V_{2}}$
(c) $\frac{2 V_{1} V_{2}}{V_{1} + V_{2}}$
(d) $\frac{L (V_{1} + V_{2})}{V_{1} V_{2}}$