Question

Jane and Sali cylced along the same 63km route.
Jane took 3.5 hours to cycle the 63 km route.
Sali started to cycle 4 minutes after Jane started to cycle.
Sali caught up with Jane when they had both cycled 30km.
Jane and Sali both cycled at constant speed
work out Salis speed in km/h

Answer 1

Given :

Time taken by Jane to complete 63 km = 3.5 hours

Sali started cycling after 4 minutes of Jane and caught up with her when they cycled 30 km .

To find :

Sali's speed in km/h .

Solution :

Speed of Jane = ( 63 / 3.5 ) km/h = 18 km/h

time taken by Jane to cover 30 km = ( 30 / 18 ) hr = 100 minutes

time taken by Sali to cover 30 km = ( 100 - 4 ) minutes = 96 minutes

speed of Sali = [ ( 30 * 60 ) / 96 ] km/h

                      = 18.75 km/h

Sali's speed is 18.75 km/h