Question

6. A car travels first 30 km with a uniform speed of
60 km h-1 and then next 30 km with a uniform speed
of 40 km h-1. Calculate : (i) the total time of journey,
(ii) the average speed of the car.
Ans.(i) 75 min, (ii) 48 km h-1.​

Answer 1

Answer:

1. 75 min 2. 48 km/h

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Answer 2

Answer:

Total distance covered by car = 60 km

And, total time taken in journey t=t1​+t2​

t=$\frac{s1}{v1}+\frac{s2}{v2}$

 =$\frac{30}{60}+ \frac{30}{40}$​

 =$\frac{5}{4}$​ h

Therefore, Average Speed=Total Distance/Total Time

                                              ​=$\frac{60}{\frac{5}{4}}$

                                              ​=48 km/h