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(a) F’s speed → 8km ÷ 1/3 hr

                        = 24 km/h

      F’s distance travelled in 60 min → 24 km

      F’s distance travelled in 15 min → 24 ÷ 4 = 8 km

      Z’s distance travelled in 15 min → 8 – 6 = 2 km

      Z’s speed → 2 ÷ 1/4 hr = 8km/h

(b) F takes 20 min to reach the starting point again.

      Z takes 1hr (8km ÷ 8km/h) to reach the starting point again.

      Therefore, F takes 1hr to complete 3 rounds and reach the starting point and meet Z. Thus the         minimum rounds for F is 3 rounds

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 Z’s distance travelled in 15 min → 8 – 6 = 2 km

 

how u got 6?

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a) In 15 min, Farhan cycled 15/20*8 = 6 km.

Zahrah cycled 8 – 6 = 2 km.

Zahrah’s speed = 2 km ÷ 15/60 h = 8 km/h

b) Farhan completes each round in 20 min.

Zahrah completes each round in 60 min.

LCM of 60 and 20 = 60

They meet 1 hour after starting.

Farhan would have cycled 3 rounds.

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