Question

10. 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
(1) 40 km/h (2) 80 km/h
(3) 46 km/h
(4) 36 km/h​

Answer 1

Answer:

30 km/hr

Explanation:

Average speed=

$\frac{distance}{time}$

speed in 1/3 of the road =20km/h

speed in 2/3 the road

=60km/h

let u assume the total distance to be 120 (LCM of 20 and 60)

D1=120

D2=120

therefore,

T1= d/s=120/20= 6hrs

T2= d/s= 120/60= 2hrs

Average speed = d1+d2/T1+T2

=120+120/6+2

=240/8

=30km/hr

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