Question

A cyclist travels 84 km at 24 km/h and then 45 km at 18 km/h. Find, for the whole journey
the total time taken.

Answer 1

Answer:

6 hours

Step-by-step explanation:

speed=distance/time

So time=distance/speed

So for first 84 km time=84/24=3.5hours

and for another 45 km time=45/18=2.5hours

Total time=3.5+2.5=6hr

Answer 2

Answer:

The cyclist travels distance= 84 km

speed of the cyclist = 24 km/h

so,

   time = $\frac{distance}{speed}$

           = $\frac{84}{24}$

           = $\frac{21}{6}$ = $3\frac{3}{6}$

           = 3h 30min

again,

     The cyclist travels distance= 45 km

     speed of the cyclist= 18 km/h

so,

   time =  $\frac{distance}{speed}$

           = $\frac{45}{18}$

           = $\frac{15}{6}$ = $2\frac{3}{6}$

           = 2h 30min

so, total time taken the cyclist to complete the journey

 = 3h 30min + 2h 30min

 = 3×60+30 + 2×60+30

 = 180+30 + 120+30

 = 210 + 150

 = 360min = 6h

hence, the cyclist took 6 hours for the whole journey