Question number 6

Dear Student,

Speed of car for first 30 minutes = 30 km/h

Speed of car for next 1 hour = 40 km/h

(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 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 = 55 km/ 1.5 hr = 36.67 km/hr

Regards