Question

e two cities.
Als 19)
A car travels first 30 km with a uniform speed of
60 km h- and then next 30 km with a uniform speed
of 40 km h-'. Calculate : (i) the total time of journey.
(ii) the average speed of the car.
Ans.(i) 75 min, (i) 48 km -
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Answer 1

Answer:

Explanation:

First case

Speed=60km/hr

Distance=30km

Time=1/2hr

Second case

Distance=30km

Speed=40km/hr

Time=3/4hr

(I)total time =1/2+3/4hr

=5/4hr=75min

(I)average speed=60/(5/4)=48km/hr