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aliina [53]
3 years ago
13

A car travels for 4(t+3) hours at a constant speed of 10(t+3) km/h. If the total distance travelled by the car is 810 km, find t

he speed of the car.
MARKING THE BRAINLIEST!!!!!
Mathematics
1 answer:
IRISSAK [1]3 years ago
8 0

Speed of the car is 45 km/h

Step-by-step explanation:

  • Step 1: Find the distance traveled by the car in the first case.

Given that the speed of the car = 10 (t + 3) km/h

Time taken = 4 (t + 3) hours

Distance = Speed × Time

               = 10 (t + 3) × 4 (t + 3) = 40(t + 3)² km

  • Step 2: Equate the distance of 810 km with the distance that has been calculated above, since both are the same.

⇒ 810 = 40 (t + 3)²

⇒ (t + 3)² = 81/4

⇒ t + 3 = √81/4 = 9/2

⇒ t = 9/2 - 3 = 3/2 = 1.5

  • Step 3: Find the speed of the car.

Speed = 10 (1.5 + 3) = 10 × 4.5 = 45 km/h

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