Question

Arrange $15km,5m,10mm$ in descending order.

• A. $10mm>5m>15km$
• B. $15km>5m>10mm$
• C. $10mm<5m>15km$
• D. $15km>10mm>5m$

Answer 1

The correct option is B $15km>5m>10mm$

Convert each value into one unit (say mm).
We know,
$15km$ = $15000m$ = $15\times {10}^{6}mm$
$5m$ = $5\times {10}^{3}mm$
Hence, the descending order of magnitudes of length is:
$15km>5m>10mm$.