# distance-time-speed

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#1
A car travels at a constant speed of 89 km/h for 15 minutes. It then decelerates at a constant rate to a speed of 56 km/h after 6 minutes.
Calculate the total distance travelled by the car
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2 years ago
#2
(Original post by x_tanzim)
A car travels at a constant speed of 89 km/h for 15 minutes. It then decelerates at a constant rate to a speed of 56 km/h after 6 minutes.
Calculate the total distance travelled by the car
Note that

So you need to use that, but right now your 'Time' is in minutes, but 'Speed' is in km per hour.

Hence you need to convert these minutes into hours first before using that formula. Using it with 89km/h and the 15mins will tell you how much it travels in those 15 minutes.
1
2 years ago
#3
(Original post by x_tanzim)
A car travels at a constant speed of 89 km/h for 15 minutes. It then decelerates at a constant rate to a speed of 56 km/h after 6 minutes.
Calculate the total distance travelled by the car
There are two distances which the car travelled:

distance 1 : 89 km/h for 15 minutes
distance 2: 56km/h for 6 minutes

distance (total) = distance 1 + distance 2 = (speed 1 x time 1) + (speed 2 x time 2)

RDKGames gave you the clue: speed is given in hour, the time in minutes. Thus you have to convert your speeds into minutes or vice versa. The rest should be done by you now.
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