Question

if the car went 30 km west in 25 min. and then 40 km south in 35 min., what would be its average speed?

Answer 1

Average speed = (distance covered) / (time to cover the distance)

= (30km + 40 km) / (25min + 35min)

= (70 km) / (60 min)

= 70 km/hour

Answer 2

70 kmph

Step-by-step explanation:

Speed =
`(Distance)/(Duration)`

Distance is the total length of the path irrespective of the direction.

S = 30 km + 40 km

S = 70 km

Duration is the time taken to move from the initial point to the final point

t = 25 min + 35 min

t = 60 min

t = 1 hour

Speed =
`(Distance)/(Duration)`

`v = (S)/(t) \\\\v = (70)/(1) \\\\v = 70 km/hour\\\\v = 70 kmph`