Question

A car moves with a speed of 40 km / hr for 15 min and then with a speed of 60km /hr for the next 15 min. Find the total distance covered by the car in these 30 min. ​

Answer 1

Answer:

25 km

Step-by-step explanation:

distance = speed × time

total distance covered

= 40 × (15/60) + 60 × (15/60)

= 10 + 15 = 25 km

Answer 2

welcome to the concept of kinematics

speed = distance/ time

then distance = speed × time

case 1 : when Speed is 40 km / hr

and t = 15 min = 15/60 hr

then distance ,D1

$= 40 \times \frac{15}{60}$

$= 10 \: km$

case 2:

when Speed is 60 km/ hr

time = 15/60 hr

then distance ,D2

$= 60 \times \frac{15}{60}$

$= 15km$

now the total distance covered by the car in 30 min = D1+D2

= (10+15)km

= 25 km

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