Question

71. A car covers the first 39 km of its
journey in 45 minutes and the
remaining 25 km in 35 minutes. What
is the average speed of the car?
[A] 40 km/hr
[B] 64 km/hr
[C] 49 km/hr
[DY 48 km/hr​

Answer 1

Answer:

[C] 49 km/hr. hebjsbknaan

Answer 2

The average speed of the car is 48 km/hr

Solution:

The average speed is given as:

$Average\ Speed = \frac{total\ distance\ covered}{total\ time\ taken}$

Given that,

A car covers the first 39 km of its  journey in 45 minutes

Remaining 25 km in 35 minutes

Total distance covered = 39 + 25 = 64 km

Total time taken = 45 min + 35 min = 80 minutes

Convert to hours

$1\ minute = \frac{1}{60}\ hour\\\\80\ minute = \frac{80}{60} = \frac{4}{3}\ hour$

Therefore,

$Average\ Speed = \frac{64}{\frac{4}{3}}\\\\Average\ Speed = \frac{64}{4} \times 3\\\\Average\ Speed = 16 \times 3 = 48$

Thus average speed of the car is 48 km/hr

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