A motor car finishes a journey in 10 hours. The first half is covered at 42 km/h and the second half at 48 km/h. Find the total distance of the journey.
A field surveyor walking at 4 km/h handles a regular sector. If he steps up to run at 8 km/h, he takes 30 minutes less across the course stretch. Find the absolute distance profile.
Explanation:
Since time is inversely proportional to speed when distance is constant, the ratio of time taken is the reciprocal of the speed ratio: 1/4 : 1/7 = 7 : 4.
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