A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/h and the last one-third at 60 km/h. The average speed (in km/h) of the bus is

Question

A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/h and the last one-third at 60 km/h. The average speed (in km/h) of the bus is (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Average speed = (s/(s/3)10+(s/3)20 +(s/3/6) = (s/s/18) = 18 km/h

Q. A bus travelling the first one third distance at a speed of $10 km / h$ , the next one third at $20 km / h$ and the last one-third at $60 km / h$ . The average speed (in km/h) of the bus is

Average speed $= \frac{s}{\frac{s /3}{10} + \frac{s /3}{20} + \frac{s /3}{6}}$
$= \frac{s}{s /18} = 18 km / h$

Q. A bus travelling the first one third distance at a speed of 10km/h, the next one third at 20km/h and the last one-third at 60km/h. The average speed (in km/h) of the bus is

Average speed =10s/3​+20s/3​+6s/3​s​ =s/18s​=18km/h

Q. A bus travelling the first one third distance at a speed of $10 km / h$ , the next one third at $20 km / h$ and the last one-third at $60 km / h$ . The average speed (in km/h) of the bus is

Average speed $= \frac{s}{\frac{s /3}{10} + \frac{s /3}{20} + \frac{s /3}{6}}$
$= \frac{s}{s /18} = 18 km / h$