24 Martha walks a distance of 10 km at a speed of x km/h. She then runs a distance of 5 km at a speed of (x+4) km/h. The total time taken for the whole journey is 3.5 hours. (a) Write down an expression in terms of x for the time Martha is walking. ............................................... h [1] (b) Show that 7x2-2x-80 = 0. [4] (c) Solve 7x2-2x-80 = 0, giving your answers correct to 2 decimal places. Y ou must show all your working. x = .................. or x = .................. [3] (d) Calculate the difference between the time Martha is walking and the time she is running. Give your answer in hours and minutes correct to the nearest minute. .................... h ................. min [3] (cid:300)(cid:213)(cid:266)(cid:174)(cid:288)(cid:180)(cid:237)(cid:200)(cid:245)(cid:207)(cid:298)(cid:197)(cid:266)(cid:222)(cid:252)(cid:181)(cid:258)(cid:215) © UCLES 2025 (cid:300)(cid:259)(cid:197)(cid:250)(cid:220)(cid:293)(cid:294)(cid:286)(cid:209)(cid:262)(cid:251)(cid:289)(cid:257)(cid:238)(cid:215)(cid:265)(cid:266)(cid:258) 0580/41/O/N/25 (cid:293)(cid:293)(cid:245)(cid:213)(cid:181)(cid:213)(cid:229)(cid:277)(cid:181)(cid:197)(cid:229)(cid:261)(cid:197)(cid:277)(cid:293)(cid:181)(cid:181)(cid:213) M SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD * 0000800000015 * 15 (cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:2)(cid:6)(cid:44) NIGRAM DFD