Question
Fri April 18, 2014 By: Disha

a car is moving with a speed of 10 km/h for 30 min with x km/h next 30 min. if the car has to travel total distance 15 km, the value of x.

Expert Reply
Fri April 18, 2014
 
We know that Distance = Speed x Time
Distance travelled with 10 km/h for 30 mins = 10 space k m divided by h r space cross times 1 half h r space equals space 5 space k m
Distance travelled with x km/h for 30 mins = x space k m divided by h r space cross times 1 half h r space equals space x over 2 k m
 
The total distance to be travelled is 15 km.
Hence, Distance with 10 km/hr speed + Distance with x km/hr = 15 km
rightwards double arrow 5 plus x over 2 equals 15 rightwards double arrow x equals 20 space k m divided by h r
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