Question

Q4 : A car travelled 30 km at a speed of 40 km/hr. and next 30 km at a speed of 20 km/hr. Calculate the average speed of the car.

Answer 1

Explanation:

average speed= total distance covered/ total time taken

total distance=30+30=60km

total time=30/40+30/20

time=3/4+3/2

t=9/4 hr

average speed=60/9/4

=240/9km/hr

hope it helps you

Answer 2

EXPLANATION.

• GIVEN

car travel 30km at a speed of 40 km/hr

next 30 km at a speed of 20 km/hr

CALCULATE THE AVERAGE SPEED OF CAR.

Total time for the journey is =

$t = \frac{d1}{v1} + \frac{d2}{v2}$

t = 30 / 40 + 30 / 20

t = 2.25 hrs

Average speed

$v(avg) = \frac{d1 + d2}{2}$

V(avg) = 30 + 20 / 2.25

V ( avg) = 26.67 km/hr

Therefore,

average speed of the car = 26.67 km/hr