Question

a car t travels with speed
30 km per hour for 30 minutes and then with speed 40 km per hour for 1 hour find the total distance travelled by the car the total time of travel and the average speed of car ​
please answer correctly ​

Answer 1

Answer:

Q6) A car travels with speed 30 km h-1 for 30 minute and then with speed 40 km h-1 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

Solution

Transcript

Solution:

Speed of car for first 30 minutes = 30 km h^{-1}

Speed of car for next 1 hour = 40 km h^{-1}

(a) total distance travelled by the car

First case

Speed = distance / time

distance = speed x time

= 30 x 0.5 ---- (30 min = 0.5 hour)

= 15 km ---- (i)

Second case

speed = 40 km h^{-1}

distance = 40 km x 1

= 40 km ---- (ii)

Adding (i) and (ii)

Total distance = 15 km + 40 km

= 55 km

(b) total time of travel = 0.5 hr + 1.0 hr = 1.5 hr

(c) average speed = total distance travelled/total time taken

= 5.5 km/ 1.5 hr

= 36.67 km h^{-1}

Answer 2

A car travels with speed 30 km h
−1
for 30 minute and then with speed 40 km h
−1
for one hour. Find: The average speed of car





Distance = Speed×Time
Distance = 30×0.5 + 40×1 = 55km
Time = 1h + 30min = 1.5h
Average speed =
Time
Distance
​
= 36.67k