Question

Q. A biker covers some distance in 10 hours. If he covers half the distance at a speed of 21 km/hr and covers the remaining distance at 24 km/hr, then find out the total distance covered by the biker.

• A. 112 km
• B. 45 km
• C. 224 km
• D. 90 km

Answer 1

The correct option is C 224 km

Average Speed

$=\frac{2XY}{X+Y}$

$=\frac{2\times 21\times 24}{21+24}$

$=\frac{2\times 21\times 24}{45}$

$=\frac{112}{5}=22.4km/hr$

$Distance=Speed\times Time=22.4\times 10=224km$