Question

a car travels 40km in 20 min next 30km in 30min calculate avg speed for the whole journey
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Answer 1

GIVEN

A car travels 40km in 20 min next 30km in 30min calculate avg speed for the whole journey

SOLUTION

A car travels 40km in 20 min

★ Distance (D1) = 40km = 0.04m

★ Time taken (t1) = 20min = 20*60 = 1200sec

Car travels next 30km in 30 min

★ Distance (D2) = 30km = 0.03m

★ Time taken (t2) = 30min = 30*60 = 1800sec

Average speed = total distance/total time taken

→ Average speed = D1 + D2/t1 + t2

→ Average speed =0.04+0.03/1200+1800

→ Average speed = 0.07/3000

→ Average speed = 2.3 m/s