Question

6 A car travels with speed 30 km for 30 minune
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
​

Answer 1

Step-by-step explanation:

a)30minutes on the speed of 30 km/hr= 30/2=. 15 kilometres

b)1:30 hours

c)70/90 = 7/9 km/min= 7/9÷60=7/9 *1/60= 7/540 km/hr

Answer 2

Answer:

(a) The total distance travelled by the car is 55 km

(b) The total time of travel is 1.5 hour

(c) The average speed of car is 36.66 kmph

Step-by-step explanation:

Speed of car for first 30 minutes = 30kmph

Speed of car for next 1 hour =40 kmph

(a) Total distance travelled by

★ Case A:

⇒ 30 minutes = 0.5 hour

⇒ Distance = Speed × Time

⇒ 30 kmph × 0.5 hour

⇒ 15 km --------------(A)

★ Case B:

⇒ Distance = Speed × Time

⇒ 40 kmph × 1 hour

⇒ 40 km --------------(B)

Total Distance = adding (A) + (B)

⇒ 15 km + 40 km

⇒ 55km

The total distance travelled by the car is 55 km

$\rule{300}{1.5}$

(b) The total time of travel :

⇒ 0.5 hour + 1 hour

⇒ 1.5 hour (1 hour 30 min)

$\rule{300}{1.5}$

(c) The average speed of car :

The average speed = Total distance / Total time

⇒ 55 / 1.5

⇒ 36.66 kmph