A motorist makes a trip of 180 km. For the first 90 km she drives at a constant speed of 30kph. At what constant speed must she drive the remaining distance if her average speed for the entire trip is to be 40 kph? (A) 50 kph (B) 60 kph (C) 70 kph (D) 80 kph

A motorist makes a trip of 180 km. For the first 90 km she drives at a constant speed of 30kph. At what constant speed must she drive the remaining distance if her average speed for the entire trip is to be 40 kph? (A) 50 kph (B) 60 kph (C) 70 kph (D) 80 kph

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter1: The Study Of Motion

Section: Chapter Questions

Problem 14P: . A long-distance runner has an average speed of 4 m/s during a race. How far does the runner travel...

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Distance and Speed

The speed, distance and time relation forms the basis of study of motion. You will need these concepts in the study of Mechanics. This concept is applicable for students who are studying the following courses –

Question

4.
A motorist makes a trip of 180 km. For the first 90 km she drives
at a constant speed of 30kph. At what constant speed must she
drive the remaining distance if her average speed for the entire
trip is to be 40 kph?
(A) 50 kph
(B) 60 kph
(C) 70 kph
(D) 80 kph

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