Question
If a truck moves at a constant speed of 30 km/h for 1
kilometre and 45 km/h for the next 1 kilometre. What is the average speed of the truck?Solution
The average speed is calculated as follows:  Total distance = 2 km  Total time = 1 / 30+ 1/ 45 hours  = 3/90+2/ 90 =5/90= 1/18 hours  Average speed = 2 km/ (1/18) hours = 36 km/h So, the average speed is 36 km/h.
Choose the appropriate answer.
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