Question

In a 1000 metre race, Rahul reaches the finishing line 5 seconds before Raj and beats Raj by 50 metre. What is Rahul's speed (in m/s)?

Accepted Answer

C. Raj takes 5 seconds to cover 50 metres, so Raj's speed $v_1 = \frac{50}{5} = 10$ m/s. Time taken by Raj to complete 1000 m = $\frac{1000}{10} = 100$ seconds. Rahul completes 1000 m in $100 - 5 = 95$ seconds. Rahul's speed $v_2 = \frac{1000}{95} = \frac{200}{19} = 10 \frac{10}{19}$ m/s.

Speed in Race

Explanation

Practise this under exam conditions