One car moving on a straight road covers one-third of the distance with 20 km/h and the rest with 60 km/h. The average speed is

Question

One car moving on a straight road covers one-third of the distance with 20 km/h and the rest with 60 km/h. The average speed is (A) 40 km/h (B) 80 km/h (C) 46 km/h (D) 36 km/h

Tardigrade Admin · Accepted Answer

Let total distance =x Average speed =( text total distance / text total time ) =(x/(x)3 × 20+(2 x)3 × 60 =(180 × x/5 x)=36 km / h

Q. One car moving on a straight road covers one-third of the distance with $20 km / h$ and the rest with $60 km / h$ . The average speed is

40 km/h

80 km/h

46 km/h

36 km/h

Let total distance $= x$
Average speed $= \frac{total distance}{total time}$
$= \frac{x}{\frac{x}{3 \times 20} + \frac{2 x}{3 \times 60}}$
$= \frac{180 \times x}{5 x} = 36 km / h$

Q. One car moving on a straight road covers one-third of the distance with 20km/h and the rest with 60km/h. The average speed is