Question

77. The speed of a car is 90 km in the
first hour and 60 km in the second
hour. What is the average speed of
the car ?
A) 72 kmph B) 75 kmph
C) 30 kmph D) 80 kmph​

Answer 1

Speed of car in 1st hour- 90km/h

Speed of car in 2nd hour- 60km/h

Total distance= 90+60

= 150km

Time taken = 2 hours

$average \: speed = \frac{total \: ditance}{total \: time}$

$= \frac{150}{2}$

$= 75kmph$

Answer 2

Answer:

<Speed> = Total Distance travelled / Total time taken

90 + 60 / 1 + 1

150/2

75 km/h