Question

You and a friend each drive 50 km to the same destination. You travel at 88.5 km/h and your friend at 94.5 km/h. How long will your friend wait for you at the end of the trip

Answer 1

Answer:

your friend will wait for you for 2.2 minutes.

Explanation:

Given;

Distance of the journey, d = 50 km

your speed, v₁ = 88.5 km/h

your friends speed, v₂ = 94.5 km/h

The time taken before you reached the end of the trip;

$time = \frac{distance }{speed} \\\\t_1 = \frac{d}{v_1} \\\\t_1 = \frac{50}{88.5} \\\\t = 0.565 \ hour$

The time taken before your friend reached the end of the trip;

$time = \frac{distance }{speed} \\\\t_2 = \frac{d}{v_2} \\\\t_2 = \frac{50}{94.5} \\\\t = 0.529 \ hour$

The difference in time = (0.565 - 0.529) hour

                                     = 0.036 hour

                                     = 0.036 x 60 min

                                     = 2.2 mins

Therefore, your friend will wait for you for 2.2 minutes.