Question

A cyclist cycles 8 km at 15 km/hr and a further
4 km at 20 km/hr. Find the average speed in
km/hr.

Answer 1

Answer:

16.363636363636...km/hr = 16 4/11 km/hr

Step-by-step explanation:

8km at 15km/hr

60/15 x 8 = 4 x 8 = 32 mins

4km at 20km/hr

60/20 x 4 = 3 x 4 = 12 mins

Total= 32+12

       = 44mins

4+8=12km

12km/44mins

12/44 x 60mins

=16.363636363636...km/hr = 16 4/11 km/hr

Answer 2

Answer:

Step-by-step explanation:speed average I'd total distance upon total time.

Total dist is 8 and 4 equals 12km.

T1 is 8÷15kmph which is 0.53 he

T2 is 4÷20kmph which is 0.2hr

T1 plus two is 0.73 hr.

Thus, avg speed is 12÷0.73

Which is 16.43kmph

Hope it helps.