Question

6. A car travels with speed 30 km h- for 30 minutes
and then with speed 40 km h for one hour,
Find :
(a) the total distance travelled by the car
(b) the total time of travel, and
(c) the average speed of car
Ans.(a) 55 km, (b) 1.5 h, (c) 36.67 km h-1​

Answer 1

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Ans.

(a) 55 km

(b) 1.5 h

(c) 36.67 km h-1✔️

The total distance is 55 km, the total time is 1.5 hours and the average speed is 36.67 km/h

Explanation:

Step 1 : Write down the relevant formulas :

Distance = Speed × Time

Average speed = Total distance / Total time.

Step 2 : Solve the questions.

1) Total distance = Distance traveled at 30 km/h in 30 minutes + Distance traveled for 1 hr at 40 km/h

Distance traveled at 30 km/h = 30 × 0.5 = 15 km

Distance traveled at 40 km/h = 40 × 1 = 40 km

Total distance = 40 km + 15 km = 55 km

2) Total time = time taken in the first part of the journey + time taken in the second part of the journey

= 0.5 + 1 = 1.5 hours

3) Average speed = Total distance / Total time.

This is given by :

= 55/1.5 = 36.67 km/h

Answer 2

Explanation:

6. A car travels with speed 30 km h- for 30 minutes

and then with speed 40 km h for one hour,

Find :

(a) the total distance travelled by the car

(b) the total time of travel, and

(c) the average speed of car

Ans.(a) 55 km, (b) 1.5 h, (c) 36.67 km h-1